212122100020 has 24 divisors (see below), whose sum is σ = 447401644200. Its totient is φ = 84478319232.

The previous prime is 212122099963. The next prime is 212122100039. The reversal of 212122100020 is 20001221212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 62201357604 + 149920742416 = 249402^2 + 387196^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23152855 + ... + 23162014.

It is an arithmetic number, because the mean of its divisors is an integer number (18641735175).

Almost surely, 2^212122100020 is an apocalyptic number.

212122100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212122100020 is an abundant number, since it is smaller than the sum of its proper divisors (235279544180).

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

212122100020 is a wasteful number, since it uses less digits than its factorization.

212122100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46315107 (or 46315105 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 212122100020 its reverse (20001221212), we get a palindrome (232123321232).

The spelling of 212122100020 in words is "two hundred twelve billion, one hundred twenty-two million, one hundred thousand, twenty".