129921211756 has 12 divisors (see below), whose sum is σ = 259842423568. Its totient is φ = 55680519312.

The previous prime is 129921211741. The next prime is 129921211759. The reversal of 129921211756 is 657112129921.

129921211756 is an admirable number.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (129921211759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2320021611 + ... + 2320021666.

Almost surely, 2^129921211756 is an apocalyptic number.

It is an amenable number.

129921211756 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129921211756 is a wasteful number, since it uses less digits than its factorization.

129921211756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4640043288 (or 4640043286 counting only the distinct ones).

The product of its digits is 136080, while the sum is 46.

The spelling of 129921211756 in words is "one hundred twenty-nine billion, nine hundred twenty-one million, two hundred eleven thousand, seven hundred fifty-six".