211995522979 has 2 divisors, whose sum is σ = 211995522980. Its totient is φ = 211995522978.

The previous prime is 211995522839. The next prime is 211995523001. The reversal of 211995522979 is 979225599112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211995522979 is a prime.

It is not a weakly prime, because it can be changed into another prime (211995522379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105997761489 + 105997761490.

It is an arithmetic number, because the mean of its divisors is an integer number (105997761490).

Almost surely, 2^211995522979 is an apocalyptic number.

211995522979 is a deficient number, since it is larger than the sum of its proper divisors (1).

211995522979 is an equidigital number, since it uses as much as digits as its factorization.

211995522979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9185400, while the sum is 61.

The spelling of 211995522979 in words is "two hundred eleven billion, nine hundred ninety-five million, five hundred twenty-two thousand, nine hundred seventy-nine".