212131021020 has 96 divisors (see below), whose sum is σ = 625328121600. Its totient is φ = 53582436864.

The previous prime is 212131020953. The next prime is 212131021057. The reversal of 212131021020 is 20120131212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10214287 + ... + 10235033.

It is an arithmetic number, because the mean of its divisors is an integer number (6513834600).

Almost surely, 2^212131021020 is an apocalyptic number.

212131021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212131021020 is an abundant number, since it is smaller than the sum of its proper divisors (413197100580).

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

212131021020 is a wasteful number, since it uses less digits than its factorization.

212131021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29747 (or 29745 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 212131021020 its reverse (20120131212), we get a palindrome (232251152232).

The spelling of 212131021020 in words is "two hundred twelve billion, one hundred thirty-one million, twenty-one thousand, twenty".