213815934381 has 32 divisors (see below), whose sum is σ = 331148632320. Its totient is φ = 120194274816.

The previous prime is 213815934377. The next prime is 213815934391. The reversal of 213815934381 is 183439518312.

It is not a de Polignac number, because 213815934381 - 2² = 213815934377 is a prime.

It is a super-2 number, since 2×213815934381² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213815934381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213815934331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77835 + ... + 658551.

It is an arithmetic number, because the mean of its divisors is an integer number (10348394760).

Almost surely, 2^213815934381 is an apocalyptic number.

213815934381 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213815934381 is a deficient number, since it is larger than the sum of its proper divisors (117332697939).

213815934381 is a wasteful number, since it uses less digits than its factorization.

213815934381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581013.

The product of its digits is 622080, while the sum is 48.

The spelling of 213815934381 in words is "two hundred thirteen billion, eight hundred fifteen million, nine hundred thirty-four thousand, three hundred eighty-one".