212013110921 has 2 divisors, whose sum is σ = 212013110922. Its totient is φ = 212013110920.

The previous prime is 212013110893. The next prime is 212013110927. The reversal of 212013110921 is 129011310212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195664675600 + 16348435321 = 442340^2 + 127861^2 .

It is a cyclic number.

It is not a de Polignac number, because 212013110921 - 2⁶ = 212013110857 is a prime.

It is not a weakly prime, because it can be changed into another prime (212013110927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106006555460 + 106006555461.

It is an arithmetic number, because the mean of its divisors is an integer number (106006555461).

Almost surely, 2^212013110921 is an apocalyptic number.

It is an amenable number.

212013110921 is a deficient number, since it is larger than the sum of its proper divisors (1).

212013110921 is an equidigital number, since it uses as much as digits as its factorization.

212013110921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 212013110921 in words is "two hundred twelve billion, thirteen million, one hundred ten thousand, nine hundred twenty-one".