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21022031 = 37568163
BaseRepresentation
bin101000000110…
…0010101001111
31110120000210202
41100030111033
520340201111
62030324115
7343453502
oct120142517
943500722
1021022031
1110959188
12705963b
134480694
142b13139
151ca3b3b
hex140c54f

21022031 has 4 divisors (see below), whose sum is σ = 21590232. Its totient is φ = 20453832.

The previous prime is 21022021. The next prime is 21022049. The reversal of 21022031 is 13022012.

Adding to 21022031 its reverse (13022012), we get a palindrome (34044043).

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21022031 - 218 = 20759887 is a prime.

It is a super-2 number, since 2×210220312 = 883851574729922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022021) 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 3 ways as a sum of consecutive naturals, for example, 284045 + ... + 284118.

It is an arithmetic number, because the mean of its divisors is an integer number (5397558).

Almost surely, 221022031 is an apocalyptic number.

21022031 is a deficient number, since it is larger than the sum of its proper divisors (568201).

21022031 is an equidigital number, since it uses as much as digits as its factorization.

21022031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568200.

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

The square root of 21022031 is about 4584.9788440079. The cubic root of 21022031 is about 275.9888630597.

The spelling of 21022031 in words is "twenty-one million, twenty-two thousand, thirty-one".

Divisors: 1 37 568163 21022031