21275434979460 has 72 divisors (see below), whose sum is σ = 64596311836056. Its totient is φ = 5668102010880.

The previous prime is 21275434979453. The next prime is 21275434979489. The reversal of 21275434979460 is 6497943457212.

21275434979460 is a `hidden beast` number, since 2 + 1 + 2 + 7 + 54 + 3 + 497 + 94 + 6 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3331179823104 + 17944255156356 = 1825152^2 + 4236066^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55509709 + ... + 55891668.

It is an arithmetic number, because the mean of its divisors is an integer number (897170997723).

Almost surely, 2^{21275434979460} is an apocalyptic number.

21275434979460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21275434979460 is an abundant number, since it is smaller than the sum of its proper divisors (43320876856596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21275434979460 is a wasteful number, since it uses less digits than its factorization.

21275434979460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111402453 (or 111402448 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 63.

The spelling of 21275434979460 in words is "twenty-one trillion, two hundred seventy-five billion, four hundred thirty-four million, nine hundred seventy-nine thousand, four hundred sixty".