37815052221 has 12 divisors (see below), whose sum is σ = 55132227072. Its totient is φ = 24974426376.

The previous prime is 37815052189. The next prime is 37815052267. The reversal of 37815052221 is 12225051873.

37815052221 is a `hidden beast` number, since 3 + 7 + 81 + 50 + 522 + 2 + 1 = 666.

It is not a de Polignac number, because 37815052221 - 2⁵ = 37815052189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37815052291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19633021 + ... + 19634946.

It is an arithmetic number, because the mean of its divisors is an integer number (4594352256).

Almost surely, 2^37815052221 is an apocalyptic number.

It is an amenable number.

37815052221 is a deficient number, since it is larger than the sum of its proper divisors (17317174851).

37815052221 is a wasteful number, since it uses less digits than its factorization.

37815052221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39268080 (or 39268077 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 37815052221 in words is "thirty-seven billion, eight hundred fifteen million, fifty-two thousand, two hundred twenty-one".