21256110352354 has 16 divisors (see below), whose sum is σ = 32068825670592. Its totient is φ = 10566503169808.

The previous prime is 21256110352327. The next prime is 21256110352361. The reversal of 21256110352354 is 45325301165212.

It is a super-2 number, since 2×21256110352354² (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, 36275667 + ... + 36856969.

It is an arithmetic number, because the mean of its divisors is an integer number (2004301604412).

Almost surely, 2^{21256110352354} is an apocalyptic number.

21256110352354 is a deficient number, since it is larger than the sum of its proper divisors (10812715318238).

21256110352354 is a wasteful number, since it uses less digits than its factorization.

21256110352354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687161.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 21256110352354 in words is "twenty-one trillion, two hundred fifty-six billion, one hundred ten million, three hundred fifty-two thousand, three hundred fifty-four".