21255215360031 has 12 divisors (see below), whose sum is σ = 30774904060680. Its totient is φ = 14136485272560.

The previous prime is 21255215359991. The next prime is 21255215360083. The reversal of 21255215360031 is 13006351255212.

21255215360031 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 5 + 2 + 15 + 3 + 600 + 31 = 666.

It is not a de Polignac number, because 21255215360031 - 2¹⁵ = 21255215327263 is a prime.

It is a super-2 number, since 2×21255215360031² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255215340031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2804854401 + ... + 2804861978.

It is an arithmetic number, because the mean of its divisors is an integer number (2564575338390).

Almost surely, 2^{21255215360031} is an apocalyptic number.

21255215360031 is a deficient number, since it is larger than the sum of its proper divisors (9519688700649).

21255215360031 is a wasteful number, since it uses less digits than its factorization.

21255215360031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5609716806 (or 5609716803 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 21255215360031 in words is "twenty-one trillion, two hundred fifty-five billion, two hundred fifteen million, three hundred sixty thousand, thirty-one".