37813618021 has 2 divisors, whose sum is σ = 37813618022. Its totient is φ = 37813618020.

The previous prime is 37813618009. The next prime is 37813618039. The reversal of 37813618021 is 12081631873.

37813618021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37152562500 + 661055521 = 192750^2 + 25711^2 .

It is a cyclic number.

It is not a de Polignac number, because 37813618021 - 2¹⁵ = 37813585253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37813618091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18906809010 + 18906809011.

It is an arithmetic number, because the mean of its divisors is an integer number (18906809011).

Almost surely, 2^37813618021 is an apocalyptic number.

It is an amenable number.

37813618021 is a deficient number, since it is larger than the sum of its proper divisors (1).

37813618021 is an equidigital number, since it uses as much as digits as its factorization.

37813618021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 37813618021 in words is "thirty-seven billion, eight hundred thirteen million, six hundred eighteen thousand, twenty-one".