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21022013 = 172942641
BaseRepresentation
bin101000000110…
…0010100111101
31110120000210002
41100030110331
520340201023
62030324045
7343453445
oct120142475
943500702
1021022013
1110959171
127059625
13448067c
142b13125
151ca3b28
hex140c53d

21022013 has 8 divisors (see below), whose sum is σ = 23026680. Its totient is φ = 19102720.

The previous prime is 21022009. The next prime is 21022021. The reversal of 21022013 is 31022012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7198489 + 13823524 = 2683^2 + 3718^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21022013 - 22 = 21022009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021985 and 21022003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20828 + ... + 21813.

It is an arithmetic number, because the mean of its divisors is an integer number (2878335).

Almost surely, 221022013 is an apocalyptic number.

It is an amenable number.

21022013 is a deficient number, since it is larger than the sum of its proper divisors (2004667).

21022013 is a wasteful number, since it uses less digits than its factorization.

21022013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42687.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21022013 is about 4584.9768810758. The cubic root of 21022013 is about 275.9887842883.

Adding to 21022013 its reverse (31022012), we get a palindrome (52044025).

Subtracting 21022013 from its reverse (31022012), we obtain a palindrome (9999999).

The spelling of 21022013 in words is "twenty-one million, twenty-two thousand, thirteen".

Divisors: 1 17 29 493 42641 724897 1236589 21022013