213131212122 has 8 divisors (see below), whose sum is σ = 426262424256. Its totient is φ = 71043737372.

The previous prime is 213131212111. The next prime is 213131212139. The reversal of 213131212122 is 221212131312.

It is a sphenic number, since it is the product of 3 distinct primes.

213131212122 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17760934338 + ... + 17760934349.

It is an arithmetic number, because the mean of its divisors is an integer number (53282803032).

Almost surely, 2^213131212122 is an apocalyptic number.

213131212122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

213131212122 is a wasteful number, since it uses less digits than its factorization.

213131212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35521868692.

The product of its digits is 288, while the sum is 21.

Adding to 213131212122 its reverse (221212131312), we get a palindrome (434343343434).

The spelling of 213131212122 in words is "two hundred thirteen billion, one hundred thirty-one million, two hundred twelve thousand, one hundred twenty-two".