212313121021 has 8 divisors (see below), whose sum is σ = 213393139200. Its totient is φ = 211235284080.

The previous prime is 212313120977. The next prime is 212313121037. The reversal of 212313121021 is 120121313212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212313121021 - 2²³ = 212304732413 is a prime.

It is a super-2 number, since 2×212313121021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212313121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212313121081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349966 + ... + 739663.

It is an arithmetic number, because the mean of its divisors is an integer number (26674142400).

Almost surely, 2^212313121021 is an apocalyptic number.

It is an amenable number.

212313121021 is a deficient number, since it is larger than the sum of its proper divisors (1080018179).

212313121021 is a wasteful number, since it uses less digits than its factorization.

212313121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090619.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 212313121021 its reverse (120121313212), we get a palindrome (332434434233).

The spelling of 212313121021 in words is "two hundred twelve billion, three hundred thirteen million, one hundred twenty-one thousand, twenty-one".