213386715844 has 9 divisors (see below), whose sum is σ = 373428369517. Its totient is φ = 106692895984.

The previous prime is 213386715791. The next prime is 213386715859. The reversal of 213386715844 is 448517683312.

The square root of 213386715844 is 461938.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 91166555844 + 122220160000 = 301938^2 + 349600^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213386715791 and 213386715800.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 808392 + ... + 1039360.

Almost surely, 2^213386715844 is an apocalyptic number.

213386715844 is the 461938-th square number.

It is an amenable number.

213386715844 is a deficient number, since it is larger than the sum of its proper divisors (160041653673).

213386715844 is an frugal number, since it uses more digits than its factorization.

213386715844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461942 (or 230971 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 52.

The spelling of 213386715844 in words is "two hundred thirteen billion, three hundred eighty-six million, seven hundred fifteen thousand, eight hundred forty-four".