212120010221021 has 6 divisors (see below), whose sum is σ = 246751848624510. Its totient is φ = 181817151617976.

The previous prime is 212120010220999. The next prime is 212120010221047. The reversal of 212120010221021 is 120122010021212.

It can be written as a sum of positive squares in only one way, i.e., 174273952053796 + 37846058167225 = 13201286^2 + 6151915^2 .

It is not a de Polignac number, because 212120010221021 - 2¹⁸ = 212120009958877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120010220021) 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, 2164489900166 + ... + 2164489900263.

It is an arithmetic number, because the mean of its divisors is an integer number (41125308104085).

Almost surely, 2^{212120010221021} is an apocalyptic number.

It is an amenable number.

212120010221021 is a deficient number, since it is larger than the sum of its proper divisors (34631838403489).

212120010221021 is an equidigital number, since it uses as much as digits as its factorization.

212120010221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328979800443 (or 4328979800436 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212120010221021 its reverse (120122010021212), we get a palindrome (332242020242233).

The spelling of 212120010221021 in words is "two hundred twelve trillion, one hundred twenty billion, ten million, two hundred twenty-one thousand, twenty-one".