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21213113 = 41517393
BaseRepresentation
bin101000011101…
…0111110111001
31110220201220212
41100322332321
520412304423
62034400505
7345210545
oct120727671
943821825
1021213113
1110a797a9
127130135
13451964c
142b62a25
151ce0578
hex143afb9

21213113 has 4 divisors (see below), whose sum is σ = 21730548. Its totient is φ = 20695680.

The previous prime is 21213109. The next prime is 21213119. The reversal of 21213113 is 31131212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9193024 + 12020089 = 3032^2 + 3467^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213113 - 22 = 21213109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21213119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258656 + ... + 258737.

It is an arithmetic number, because the mean of its divisors is an integer number (5432637).

Almost surely, 221213113 is an apocalyptic number.

It is an amenable number.

21213113 is a deficient number, since it is larger than the sum of its proper divisors (517435).

21213113 is an equidigital number, since it uses as much as digits as its factorization.

21213113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517434.

The product of its digits is 36, while the sum is 14.

The square root of 21213113 is about 4605.7695339650. The cubic root of 21213113 is about 276.8225522697.

Adding to 21213113 its reverse (31131212), we get a palindrome (52344325).

The spelling of 21213113 in words is "twenty-one million, two hundred thirteen thousand, one hundred thirteen".

Divisors: 1 41 517393 21213113