29957821109 has 2 divisors, whose sum is σ = 29957821110. Its totient is φ = 29957821108.

The previous prime is 29957821097. The next prime is 29957821129. The reversal of 29957821109 is 90112875992.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18665570884 + 11292250225 = 136622^2 + 106265^2 .

It is a cyclic number.

It is not a de Polignac number, because 29957821109 - 2⁸ = 29957820853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29957821129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14978910554 + 14978910555.

It is an arithmetic number, because the mean of its divisors is an integer number (14978910555).

Almost surely, 2^29957821109 is an apocalyptic number.

It is an amenable number.

29957821109 is a deficient number, since it is larger than the sum of its proper divisors (1).

29957821109 is an equidigital number, since it uses as much as digits as its factorization.

29957821109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 53.

The spelling of 29957821109 in words is "twenty-nine billion, nine hundred fifty-seven million, eight hundred twenty-one thousand, one hundred nine".