11939937021 has 24 divisors (see below), whose sum is σ = 17403466080. Its totient is φ = 7887852576.

The previous prime is 11939937019. The next prime is 11939937071. The reversal of 11939937021 is 12073993911.

11939937021 is a `hidden beast` number, since 1 + 193 + 99 + 370 + 2 + 1 = 666.

It is not a de Polignac number, because 11939937021 - 2¹ = 11939937019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11939937001) 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 23 ways as a sum of consecutive naturals, for example, 465510 + ... + 490488.

It is an arithmetic number, because the mean of its divisors is an integer number (725144420).

Almost surely, 2^11939937021 is an apocalyptic number.

It is an amenable number.

11939937021 is a deficient number, since it is larger than the sum of its proper divisors (5463529059).

11939937021 is a wasteful number, since it uses less digits than its factorization.

11939937021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25465 (or 25462 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 45.

The spelling of 11939937021 in words is "eleven billion, nine hundred thirty-nine million, nine hundred thirty-seven thousand, twenty-one".