212120290021 has 2 divisors, whose sum is σ = 212120290022. Its totient is φ = 212120290020.

The previous prime is 212120290013. The next prime is 212120290033. The reversal of 212120290021 is 120092021212.

212120290021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195178404100 + 16941885921 = 441790^2 + 130161^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120290021 - 2³ = 212120290013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212120289974 and 212120290001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212120290121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060145010 + 106060145011.

It is an arithmetic number, because the mean of its divisors is an integer number (106060145011).

Almost surely, 2^212120290021 is an apocalyptic number.

It is an amenable number.

212120290021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212120290021 is an equidigital number, since it uses as much as digits as its factorization.

212120290021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 212120290021 in words is "two hundred twelve billion, one hundred twenty million, two hundred ninety thousand, twenty-one".