12021139437975 has 18 divisors (see below), whose sum is σ = 21531196415976. Its totient is φ = 6411274366800.

The previous prime is 12021139437889. The next prime is 12021139438001. The reversal of 12021139437975 is 57973493112021.

12021139437975 is a `hidden beast` number, since 1 + 2 + 0 + 2 + 1 + 139 + 437 + 9 + 75 = 666.

It is not a de Polignac number, because 12021139437975 - 2⁷ = 12021139437847 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 26713642971 + ... + 26713643420.

Almost surely, 2^{12021139437975} is an apocalyptic number.

12021139437975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12021139437975 is a deficient number, since it is larger than the sum of its proper divisors (9510056978001).

12021139437975 is a wasteful number, since it uses less digits than its factorization.

12021139437975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53427286407 (or 53427286399 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The spelling of 12021139437975 in words is "twelve trillion, twenty-one billion, one hundred thirty-nine million, four hundred thirty-seven thousand, nine hundred seventy-five".