21255872281235 has 24 divisors (see below), whose sum is σ = 26943329369520. Its totient is φ = 16095860278848.

The previous prime is 21255872281229. The next prime is 21255872281271. The reversal of 21255872281235 is 53218227855212.

It is not a de Polignac number, because 21255872281235 - 2²² = 21255868086931 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2963600 + ... + 7162029.

It is an arithmetic number, because the mean of its divisors is an integer number (1122638723730).

Almost surely, 2^{21255872281235} is an apocalyptic number.

21255872281235 is a deficient number, since it is larger than the sum of its proper divisors (5687457088285).

21255872281235 is a wasteful number, since it uses less digits than its factorization.

21255872281235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10126835 (or 10126816 counting only the distinct ones).

The product of its digits is 5376000, while the sum is 53.

The spelling of 21255872281235 in words is "twenty-one trillion, two hundred fifty-five billion, eight hundred seventy-two million, two hundred eighty-one thousand, two hundred thirty-five".