21255154281 has 48 divisors (see below), whose sum is σ = 33192694080. Its totient is φ = 13058288640.

The previous prime is 21255154253. The next prime is 21255154313. The reversal of 21255154281 is 18245155212.

21255154281 is a `hidden beast` number, since 2 + 1 + 25 + 515 + 42 + 81 = 666.

It is not a de Polignac number, because 21255154281 - 2⁷ = 21255154153 is a prime.

It is a super-2 number, since 2×21255154281² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21255150281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1545646 + ... + 1559336.

It is an arithmetic number, because the mean of its divisors is an integer number (691514460).

Almost surely, 2^21255154281 is an apocalyptic number.

It is an amenable number.

21255154281 is a deficient number, since it is larger than the sum of its proper divisors (11937539799).

21255154281 is a wasteful number, since it uses less digits than its factorization.

21255154281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13926 (or 13923 counting only the distinct ones).

The product of its digits is 32000, while the sum is 36.

The spelling of 21255154281 in words is "twenty-one billion, two hundred fifty-five million, one hundred fifty-four thousand, two hundred eighty-one".