212211209957 has 2 divisors, whose sum is σ = 212211209958. Its totient is φ = 212211209956.

The previous prime is 212211209953. The next prime is 212211210037. The reversal of 212211209957 is 759902112212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157080639556 + 55130570401 = 396334^2 + 234799^2 .

It is a cyclic number.

It is not a de Polignac number, because 212211209957 - 2² = 212211209953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212211209953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106105604978 + 106105604979.

It is an arithmetic number, because the mean of its divisors is an integer number (106105604979).

Almost surely, 2^212211209957 is an apocalyptic number.

It is an amenable number.

212211209957 is a deficient number, since it is larger than the sum of its proper divisors (1).

212211209957 is an equidigital number, since it uses as much as digits as its factorization.

212211209957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 212211209957 in words is "two hundred twelve billion, two hundred eleven million, two hundred nine thousand, nine hundred fifty-seven".