21278573851692 has 54 divisors (see below), whose sum is σ = 49894334873292. Its totient is φ = 7058123948400.

The previous prime is 21278573851679. The next prime is 21278573851747. The reversal of 21278573851692 is 29615837587212.

It is a super-2 number, since 2×21278573851692² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3371661217 + ... + 3371667527.

Almost surely, 2^{21278573851692} is an apocalyptic number.

It is an amenable number.

21278573851692 is an abundant number, since it is smaller than the sum of its proper divisors (28615761021600).

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

21278573851692 is an frugal number, since it uses more digits than its factorization.

21278573851692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13051 (or 6527 counting only the distinct ones).

The product of its digits is 101606400, while the sum is 66.

The spelling of 21278573851692 in words is "twenty-one trillion, two hundred seventy-eight billion, five hundred seventy-three million, eight hundred fifty-one thousand, six hundred ninety-two".