129964953921 has 32 divisors (see below), whose sum is σ = 191750553600. Its totient is φ = 77640526080.

The previous prime is 129964953901. The next prime is 129964953929. The reversal of 129964953921 is 129359469921.

It is not a de Polignac number, because 129964953921 - 2¹⁴ = 129964937537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129964953929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1541385 + ... + 1623513.

It is an arithmetic number, because the mean of its divisors is an integer number (5992204800).

Almost surely, 2^129964953921 is an apocalyptic number.

129964953921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129964953921 is a deficient number, since it is larger than the sum of its proper divisors (61785599679).

129964953921 is a wasteful number, since it uses less digits than its factorization.

129964953921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82829.

The product of its digits is 9447840, while the sum is 60.

The spelling of 129964953921 in words is "one hundred twenty-nine billion, nine hundred sixty-four million, nine hundred fifty-three thousand, nine hundred twenty-one".