212528621 has 2 divisors, whose sum is σ = 212528622. Its totient is φ = 212528620.

The previous prime is 212528587. The next prime is 212528627. The reversal of 212528621 is 126825212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194295721 + 18232900 = 13939^2 + 4270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212528621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212528627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106264310 + 106264311.

It is an arithmetic number, because the mean of its divisors is an integer number (106264311).

Almost surely, 2^212528621 is an apocalyptic number.

It is an amenable number.

212528621 is a deficient number, since it is larger than the sum of its proper divisors (1).

212528621 is an equidigital number, since it uses as much as digits as its factorization.

212528621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

The square root of 212528621 is about 14578.3613962612. The cubic root of 212528621 is about 596.7683858844.

The spelling of 212528621 in words is "two hundred twelve million, five hundred twenty-eight thousand, six hundred twenty-one".