212167756901 has 2 divisors, whose sum is σ = 212167756902. Its totient is φ = 212167756900.

The previous prime is 212167756837. The next prime is 212167756919. The reversal of 212167756901 is 109657761212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146976390625 + 65191366276 = 383375^2 + 255326^2 .

It is a cyclic number.

It is not a de Polignac number, because 212167756901 - 2⁶ = 212167756837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212167756951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106083878450 + 106083878451.

It is an arithmetic number, because the mean of its divisors is an integer number (106083878451).

Almost surely, 2^212167756901 is an apocalyptic number.

It is an amenable number.

212167756901 is a deficient number, since it is larger than the sum of its proper divisors (1).

212167756901 is an equidigital number, since it uses as much as digits as its factorization.

212167756901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 47.

The spelling of 212167756901 in words is "two hundred twelve billion, one hundred sixty-seven million, seven hundred fifty-six thousand, nine hundred one".