212302321021 has 6 divisors (see below), whose sum is σ = 246963924510. Its totient is φ = 181973417976.

The previous prime is 212302321019. The next prime is 212302321027. The reversal of 212302321021 is 120123203212.

It can be written as a sum of positive squares in only one way, i.e., 134039460996 + 78262860025 = 366114^2 + 279755^2 .

It is not a de Polignac number, because 212302321021 - 2¹ = 212302321019 is a prime.

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 212302321021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212302321027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2166350166 + ... + 2166350263.

It is an arithmetic number, because the mean of its divisors is an integer number (41160654085).

Almost surely, 2^212302321021 is an apocalyptic number.

It is an amenable number.

212302321021 is a deficient number, since it is larger than the sum of its proper divisors (34661603489).

212302321021 is an equidigital number, since it uses as much as digits as its factorization.

212302321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4332700443 (or 4332700436 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 212302321021 its reverse (120123203212), we get a palindrome (332425524233).

The spelling of 212302321021 in words is "two hundred twelve billion, three hundred two million, three hundred twenty-one thousand, twenty-one".