213179686722 has 18 divisors (see below), whose sum is σ = 461893565523. Its totient is φ = 71059242612.

The previous prime is 213179686679. The next prime is 213179686739. The reversal of 213179686722 is 227686971312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 106589843361 + 106589843361 = 326481^2 + 326481^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=326481.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1904473 + ... + 2013299.

Almost surely, 2^213179686722 is an apocalyptic number.

213179686722 is an abundant number, since it is smaller than the sum of its proper divisors (248713878801).

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

213179686722 is an frugal number, since it uses more digits than its factorization.

213179686722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217662 (or 108832 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 213179686722 in words is "two hundred thirteen billion, one hundred seventy-nine million, six hundred eighty-six thousand, seven hundred twenty-two".