213166973772 has 36 divisors (see below), whose sum is σ = 538972912296. Its totient is φ = 71037964800.

The previous prime is 213166973737. The next prime is 213166973807. The reversal of 213166973772 is 277379661312.

213166973772 is a `hidden beast` number, since 21 + 3 + 166 + 97 + 377 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (213166973737) and next prime (213166973807).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×213166973772² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 590229 + ... + 880172.

It is an arithmetic number, because the mean of its divisors is an integer number (14971469786).

Almost surely, 2^213166973772 is an apocalyptic number.

It is an amenable number.

213166973772 is an abundant number, since it is smaller than the sum of its proper divisors (325805938524).

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

213166973772 is a wasteful number, since it uses less digits than its factorization.

213166973772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474438 (or 1474433 counting only the distinct ones).

The product of its digits is 4000752, while the sum is 54.

The spelling of 213166973772 in words is "two hundred thirteen billion, one hundred sixty-six million, nine hundred seventy-three thousand, seven hundred seventy-two".