212312121020 has 12 divisors (see below), whose sum is σ = 445855454184. Its totient is φ = 84924848400.

The previous prime is 212312121019. The next prime is 212312121079. The reversal of 212312121020 is 20121213212.

It is a super-2 number, since 2×212312121020² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212312121020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5307803006 + ... + 5307803045.

It is an arithmetic number, because the mean of its divisors is an integer number (37154621182).

Almost surely, 2^212312121020 is an apocalyptic number.

212312121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212312121020 is an abundant number, since it is smaller than the sum of its proper divisors (233543333164).

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

212312121020 is a wasteful number, since it uses less digits than its factorization.

212312121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10615606060 (or 10615606058 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 212312121020 its reverse (20121213212), we get a palindrome (232433334232).

The spelling of 212312121020 in words is "two hundred twelve billion, three hundred twelve million, one hundred twenty-one thousand, twenty".