21255872281181 has 8 divisors (see below), whose sum is σ = 21374973082080. Its totient is φ = 21136775401872.

The previous prime is 21255872281153. The next prime is 21255872281207. The reversal of 21255872281181 is 18118227855212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21255872281181 - 2¹⁰ = 21255872280157 is a prime.

It is a super-2 number, since 2×21255872281181² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255871281181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10249751 + ... + 12147803.

It is an arithmetic number, because the mean of its divisors is an integer number (2671871635260).

Almost surely, 2^{21255872281181} is an apocalyptic number.

It is an amenable number.

21255872281181 is a deficient number, since it is larger than the sum of its proper divisors (119100800899).

21255872281181 is a wasteful number, since it uses less digits than its factorization.

21255872281181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960795.

The product of its digits is 1433600, while the sum is 53.

The spelling of 21255872281181 in words is "twenty-one trillion, two hundred fifty-five billion, eight hundred seventy-two million, two hundred eighty-one thousand, one hundred eighty-one".