12950021691 has 40 divisors (see below), whose sum is σ = 20378684480. Its totient is φ = 8172766512.

The previous prime is 12950021681. The next prime is 12950021699. The reversal of 12950021691 is 19612005921.

12950021691 is a `hidden beast` number, since 129 + 500 + 21 + 6 + 9 + 1 = 666.

12950021691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12950021691 - 2⁶ = 12950021627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12950021699) 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 in 39 ways as a sum of consecutive naturals, for example, 2871060 + ... + 2875566.

It is an arithmetic number, because the mean of its divisors is an integer number (509467112).

Almost surely, 2^12950021691 is an apocalyptic number.

12950021691 is a deficient number, since it is larger than the sum of its proper divisors (7428662789).

12950021691 is a wasteful number, since it uses less digits than its factorization.

12950021691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6405 (or 6396 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The spelling of 12950021691 in words is "twelve billion, nine hundred fifty million, twenty-one thousand, six hundred ninety-one".