37991122021 has 4 divisors (see below), whose sum is σ = 38171174944. Its totient is φ = 37811069100.

The previous prime is 37991122009. The next prime is 37991122073. The reversal of 37991122021 is 12022119973.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12022119973 = 4363 ⋅2755471.

It is a cyclic number.

It is not a de Polignac number, because 37991122021 - 2⁷ = 37991121893 is a prime.

It is a super-2 number, since 2×37991122021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37991122121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90026145 + ... + 90026566.

It is an arithmetic number, because the mean of its divisors is an integer number (9542793736).

Almost surely, 2^37991122021 is an apocalyptic number.

It is an amenable number.

37991122021 is a deficient number, since it is larger than the sum of its proper divisors (180052923).

37991122021 is a wasteful number, since it uses less digits than its factorization.

37991122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180052922.

The product of its (nonzero) digits is 13608, while the sum is 37.

The spelling of 37991122021 in words is "thirty-seven billion, nine hundred ninety-one million, one hundred twenty-two thousand, twenty-one".