37871996921 has 16 divisors (see below), whose sum is σ = 41573917440. Its totient is φ = 34213441920.

The previous prime is 37871996893. The next prime is 37871996923. The reversal of 37871996921 is 12969917873.

It is a cyclic number.

It is not a de Polignac number, because 37871996921 - 2³⁴ = 20692127737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (37871996923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5646656 + ... + 5653358.

It is an arithmetic number, because the mean of its divisors is an integer number (2598369840).

Almost surely, 2^37871996921 is an apocalyptic number.

It is an amenable number.

37871996921 is a deficient number, since it is larger than the sum of its proper divisors (3701920519).

37871996921 is a wasteful number, since it uses less digits than its factorization.

37871996921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9856.

The product of its digits is 10287648, while the sum is 62.

The spelling of 37871996921 in words is "thirty-seven billion, eight hundred seventy-one million, nine hundred ninety-six thousand, nine hundred twenty-one".