37991212021 has 16 divisors (see below), whose sum is σ = 45315479808. Its totient is φ = 31141756800.

The previous prime is 37991212001. The next prime is 37991212027. The reversal of 37991212021 is 12021219973.

It is not a de Polignac number, because 37991212021 - 2¹⁷ = 37991080949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37991212027) 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, 877401 + ... + 919681.

It is an arithmetic number, because the mean of its divisors is an integer number (2832217488).

Almost surely, 2^37991212021 is an apocalyptic number.

It is an amenable number.

37991212021 is a deficient number, since it is larger than the sum of its proper divisors (7324267787).

37991212021 is a wasteful number, since it uses less digits than its factorization.

37991212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47892.

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

The spelling of 37991212021 in words is "thirty-seven billion, nine hundred ninety-one million, two hundred twelve thousand, twenty-one".