21358675491372 has 48 divisors (see below), whose sum is σ = 55374670320480. Its totient is φ = 7119516524544.

The previous prime is 21358675491323. The next prime is 21358675491427. The reversal of 21358675491372 is 27319457685312.

21358675491372 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 8 + 6 + 7 + 549 + 13 + 72 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21771628 + ... + 22731500.

It is an arithmetic number, because the mean of its divisors is an integer number (1153638965010).

Almost surely, 2^{21358675491372} is an apocalyptic number.

It is an amenable number.

21358675491372 is an abundant number, since it is smaller than the sum of its proper divisors (34015994829108).

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

21358675491372 is a wasteful number, since it uses less digits than its factorization.

21358675491372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165919 (or 1165911 counting only the distinct ones).

The product of its digits is 76204800, while the sum is 63.

The spelling of 21358675491372 in words is "twenty-one trillion, three hundred fifty-eight billion, six hundred seventy-five million, four hundred ninety-one thousand, three hundred seventy-two".