129621298979 has 2 divisors, whose sum is σ = 129621298980. Its totient is φ = 129621298978.

The previous prime is 129621298943. The next prime is 129621298997. The reversal of 129621298979 is 979892126921.

It is a happy number.

Together with next prime (129621298997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (979892126921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129621298979 - 2²⁴ = 129604521763 is a prime.

It is a super-2 number, since 2×129621298979² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129621258979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64810649489 + 64810649490.

It is an arithmetic number, because the mean of its divisors is an integer number (64810649490).

Almost surely, 2^129621298979 is an apocalyptic number.

129621298979 is a deficient number, since it is larger than the sum of its proper divisors (1).

129621298979 is an equidigital number, since it uses as much as digits as its factorization.

129621298979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 65.

The spelling of 129621298979 in words is "one hundred twenty-nine billion, six hundred twenty-one million, two hundred ninety-eight thousand, nine hundred seventy-nine".