21857838113 has 4 divisors (see below), whose sum is σ = 21972277248. Its totient is φ = 21743398980.

The previous prime is 21857838103. The next prime is 21857838161. The reversal of 21857838113 is 31183875812.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21857838113 - 2⁸ = 21857837857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21857838103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57219281 + ... + 57219662.

It is an arithmetic number, because the mean of its divisors is an integer number (5493069312).

Almost surely, 2^21857838113 is an apocalyptic number.

It is an amenable number.

21857838113 is a deficient number, since it is larger than the sum of its proper divisors (114439135).

21857838113 is a wasteful number, since it uses less digits than its factorization.

21857838113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114439134.

The product of its digits is 322560, while the sum is 47.

The spelling of 21857838113 in words is "twenty-one billion, eight hundred fifty-seven million, eight hundred thirty-eight thousand, one hundred thirteen".