212131231220 has 96 divisors (see below), whose sum is σ = 461376518400. Its totient is φ = 81893504000.

The previous prime is 212131231211. The next prime is 212131231231. The reversal of 212131231220 is 22132131212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 212131231192 and 212131231201.

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 31 ways as a sum of consecutive naturals, for example, 12756071 + ... + 12772689.

It is an arithmetic number, because the mean of its divisors is an integer number (4806005400).

Almost surely, 2^212131231220 is an apocalyptic number.

212131231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212131231220 is an abundant number, since it is smaller than the sum of its proper divisors (249245287180).

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

212131231220 is a wasteful number, since it uses less digits than its factorization.

212131231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16889 (or 16887 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 212131231220 its reverse (22132131212), we get a palindrome (234263362432).

The spelling of 212131231220 in words is "two hundred twelve billion, one hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty".