213121132312 has 24 divisors (see below), whose sum is σ = 439232087700. Its totient is φ = 96873241520.

The previous prime is 213121132309. The next prime is 213121132331. The reversal of 213121132312 is 213231121312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110082262 + ... + 110084197.

Almost surely, 2^213121132312 is an apocalyptic number.

213121132312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

213121132312 is an abundant number, since it is smaller than the sum of its proper divisors (226110955388).

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

213121132312 is a wasteful number, since it uses less digits than its factorization.

213121132312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220166487 (or 220166472 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

Adding to 213121132312 its reverse (213231121312), we get a palindrome (426352253624).

The spelling of 213121132312 in words is "two hundred thirteen billion, one hundred twenty-one million, one hundred thirty-two thousand, three hundred twelve".