212957450021 has 2 divisors, whose sum is σ = 212957450022. Its totient is φ = 212957450020.

The previous prime is 212957450011. The next prime is 212957450033. The reversal of 212957450021 is 120054759212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113252440900 + 99705009121 = 336530^2 + 315761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212957450021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212957450011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106478725010 + 106478725011.

It is an arithmetic number, because the mean of its divisors is an integer number (106478725011).

Almost surely, 2^212957450021 is an apocalyptic number.

It is an amenable number.

212957450021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212957450021 is an equidigital number, since it uses as much as digits as its factorization.

212957450021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 212957450021 in words is "two hundred twelve billion, nine hundred fifty-seven million, four hundred fifty thousand, twenty-one".