21256110352355 has 8 divisors (see below), whose sum is σ = 26386895610000. Its totient is φ = 16418512823776.

The previous prime is 21256110352327. The next prime is 21256110352361. The reversal of 21256110352355 is 55325301165212.

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 21256110352355 - 2²⁸ = 21255841916899 is a prime.

It is a super-2 number, since 2×21256110352355² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73296932105 + ... + 73296932394.

It is an arithmetic number, because the mean of its divisors is an integer number (3298361951250).

Almost surely, 2^{21256110352355} is an apocalyptic number.

21256110352355 is a deficient number, since it is larger than the sum of its proper divisors (5130785257645).

21256110352355 is a wasteful number, since it uses less digits than its factorization.

21256110352355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146593864533.

The product of its (nonzero) digits is 270000, while the sum is 41.

The spelling of 21256110352355 in words is "twenty-one trillion, two hundred fifty-six billion, one hundred ten million, three hundred fifty-two thousand, three hundred fifty-five".