21255433356157 has 32 divisors (see below), whose sum is σ = 28573190311680. Its totient is φ = 15270180549120.

The previous prime is 21255433356127. The next prime is 21255433356181. The reversal of 21255433356157 is 75165333455212.

It is not a de Polignac number, because 21255433356157 - 2³⁵ = 21221073617789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255433356127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11977288 + ... + 13636945.

It is an arithmetic number, because the mean of its divisors is an integer number (892912197240).

Almost surely, 2^{21255433356157} is an apocalyptic number.

It is an amenable number.

21255433356157 is a deficient number, since it is larger than the sum of its proper divisors (7317756955523).

21255433356157 is a wasteful number, since it uses less digits than its factorization.

21255433356157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25615093.

The product of its digits is 11340000, while the sum is 52.

The spelling of 21255433356157 in words is "twenty-one trillion, two hundred fifty-five billion, four hundred thirty-three million, three hundred fifty-six thousand, one hundred fifty-seven".