211210199957 has 2 divisors, whose sum is σ = 211210199958. Its totient is φ = 211210199956.

The previous prime is 211210199903. The next prime is 211210200017. The reversal of 211210199957 is 759991012112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152794210321 + 58415989636 = 390889^2 + 241694^2 .

It is a cyclic number.

It is not a de Polignac number, because 211210199957 - 2⁸ = 211210199701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211210198957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605099978 + 105605099979.

It is an arithmetic number, because the mean of its divisors is an integer number (105605099979).

Almost surely, 2^211210199957 is an apocalyptic number.

It is an amenable number.

211210199957 is a deficient number, since it is larger than the sum of its proper divisors (1).

211210199957 is an equidigital number, since it uses as much as digits as its factorization.

211210199957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 47.

The spelling of 211210199957 in words is "two hundred eleven billion, two hundred ten million, one hundred ninety-nine thousand, nine hundred fifty-seven".