212492521 has 2 divisors, whose sum is σ = 212492522. Its totient is φ = 212492520.

The previous prime is 212492519. The next prime is 212492551. The reversal of 212492521 is 125294212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181845225 + 30647296 = 13485^2 + 5536^2 .

It is a cyclic number.

It is not a de Polignac number, because 212492521 - 2¹ = 212492519 is a prime.

Together with 212492519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 212492521.

It is not a weakly prime, because it can be changed into another prime (212492551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106246260 + 106246261.

It is an arithmetic number, because the mean of its divisors is an integer number (106246261).

Almost surely, 2^212492521 is an apocalyptic number.

It is an amenable number.

212492521 is a deficient number, since it is larger than the sum of its proper divisors (1).

212492521 is an equidigital number, since it uses as much as digits as its factorization.

212492521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

The square root of 212492521 is about 14577.1232072724. The cubic root of 212492521 is about 596.7345950495.

The spelling of 212492521 in words is "two hundred twelve million, four hundred ninety-two thousand, five hundred twenty-one".