29957821129 has 2 divisors, whose sum is σ = 29957821130. Its totient is φ = 29957821128.

The previous prime is 29957821109. The next prime is 29957821133. The reversal of 29957821129 is 92112875992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15713876025 + 14243945104 = 125355^2 + 119348^2 .

It is a cyclic number.

It is not a de Polignac number, because 29957821129 - 2⁵ = 29957821097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29957821129.

It is not a weakly prime, because it can be changed into another prime (29957821109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14978910564 + 14978910565.

It is an arithmetic number, because the mean of its divisors is an integer number (14978910565).

Almost surely, 2^29957821129 is an apocalyptic number.

It is an amenable number.

29957821129 is a deficient number, since it is larger than the sum of its proper divisors (1).

29957821129 is an equidigital number, since it uses as much as digits as its factorization.

29957821129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 55.

The spelling of 29957821129 in words is "twenty-nine billion, nine hundred fifty-seven million, eight hundred twenty-one thousand, one hundred twenty-nine".