213196393638 has 48 divisors (see below), whose sum is σ = 472876644240. Its totient is φ = 69382135872.

The previous prime is 213196393603. The next prime is 213196393687. The reversal of 213196393638 is 836393691312.

213196393638 is a `hidden beast` number, since 2 + 1 + 3 + 196 + 393 + 63 + 8 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1727520 + ... + 1846812.

It is an arithmetic number, because the mean of its divisors is an integer number (9851596755).

Almost surely, 2^213196393638 is an apocalyptic number.

213196393638 is an abundant number, since it is smaller than the sum of its proper divisors (259680250602).

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

213196393638 is a wasteful number, since it uses less digits than its factorization.

213196393638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121653 (or 121650 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 54.

The spelling of 213196393638 in words is "two hundred thirteen billion, one hundred ninety-six million, three hundred ninety-three thousand, six hundred thirty-eight".