21421157334260 has 24 divisors (see below), whose sum is σ = 45382522711176. Its totient is φ = 8492635827200.

The previous prime is 21421157334151. The next prime is 21421157334281. The reversal of 21421157334260 is 6243375112412.

It can be written as a sum of positive squares in 4 ways, for example, as 277842843664 + 21143314490596 = 527108^2 + 4598186^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4739191841 + ... + 4739196360.

It is an arithmetic number, because the mean of its divisors is an integer number (1890938446299).

Almost surely, 2^{21421157334260} is an apocalyptic number.

21421157334260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421157334260 is an abundant number, since it is smaller than the sum of its proper divisors (23961365376916).

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

21421157334260 is a wasteful number, since it uses less digits than its factorization.

21421157334260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9478388323 (or 9478388321 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 21421157334260 in words is "twenty-one trillion, four hundred twenty-one billion, one hundred fifty-seven million, three hundred thirty-four thousand, two hundred sixty".