21251797348404 has 48 divisors (see below), whose sum is σ = 59654168000000. Its totient is φ = 5752366199136.

The previous prime is 21251797348393. The next prime is 21251797348421. The reversal of 21251797348404 is 40484379715212.

It is a super-2 number, since 2×21251797348404² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6657829654 + ... + 6657832845.

Almost surely, 2^{21251797348404} is an apocalyptic number.

It is an amenable number.

21251797348404 is an abundant number, since it is smaller than the sum of its proper divisors (38402370651596).

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

21251797348404 is a wasteful number, since it uses less digits than its factorization.

21251797348404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13315662532 (or 13315662530 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 57.

The spelling of 21251797348404 in words is "twenty-one trillion, two hundred fifty-one billion, seven hundred ninety-seven million, three hundred forty-eight thousand, four hundred four".