212102109979 has 2 divisors, whose sum is σ = 212102109980. Its totient is φ = 212102109978.

The previous prime is 212102109929. The next prime is 212102110001. The reversal of 212102109979 is 979901201212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212102109979 - 2³⁷ = 74663156507 is a prime.

It is a super-2 number, since 2×212102109979² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212102109929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106051054989 + 106051054990.

It is an arithmetic number, because the mean of its divisors is an integer number (106051054990).

Almost surely, 2^212102109979 is an apocalyptic number.

212102109979 is a deficient number, since it is larger than the sum of its proper divisors (1).

212102109979 is an equidigital number, since it uses as much as digits as its factorization.

212102109979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 212102109979 in words is "two hundred twelve billion, one hundred two million, one hundred nine thousand, nine hundred seventy-nine".