212431086521 has 2 divisors, whose sum is σ = 212431086522. Its totient is φ = 212431086520.

The previous prime is 212431086493. The next prime is 212431086541. The reversal of 212431086521 is 125680134212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208123002025 + 4308084496 = 456205^2 + 65636^2 .

It is a cyclic number.

It is not a de Polignac number, because 212431086521 - 2³⁰ = 211357344697 is a prime.

It is not a weakly prime, because it can be changed into another prime (212431086541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106215543260 + 106215543261.

It is an arithmetic number, because the mean of its divisors is an integer number (106215543261).

Almost surely, 2^212431086521 is an apocalyptic number.

It is an amenable number.

212431086521 is a deficient number, since it is larger than the sum of its proper divisors (1).

212431086521 is an equidigital number, since it uses as much as digits as its factorization.

212431086521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 212431086521 in words is "two hundred twelve billion, four hundred thirty-one million, eighty-six thousand, five hundred twenty-one".