38620501921 has 2 divisors, whose sum is σ = 38620501922. Its totient is φ = 38620501920.

The previous prime is 38620501903. The next prime is 38620501951. The reversal of 38620501921 is 12910502683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37070111296 + 1550390625 = 192536^2 + 39375^2 .

It is a cyclic number.

It is not a de Polignac number, because 38620501921 - 2¹⁹ = 38619977633 is a prime.

It is not a weakly prime, because it can be changed into another prime (38620501951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19310250960 + 19310250961.

It is an arithmetic number, because the mean of its divisors is an integer number (19310250961).

Almost surely, 2^38620501921 is an apocalyptic number.

It is an amenable number.

38620501921 is a deficient number, since it is larger than the sum of its proper divisors (1).

38620501921 is an equidigital number, since it uses as much as digits as its factorization.

38620501921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 38620501921 in words is "thirty-eight billion, six hundred twenty million, five hundred one thousand, nine hundred twenty-one".