44685139921 has 2 divisors, whose sum is σ = 44685139922. Its totient is φ = 44685139920.

The previous prime is 44685139907. The next prime is 44685140041. The reversal of 44685139921 is 12993158644.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35088782400 + 9596357521 = 187320^2 + 97961^2 .

It is a cyclic number.

It is not a de Polignac number, because 44685139921 - 2²³ = 44676751313 is a prime.

It is not a weakly prime, because it can be changed into another prime (44685139321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22342569960 + 22342569961.

It is an arithmetic number, because the mean of its divisors is an integer number (22342569961).

Almost surely, 2^44685139921 is an apocalyptic number.

It is an amenable number.

44685139921 is a deficient number, since it is larger than the sum of its proper divisors (1).

44685139921 is an equidigital number, since it uses as much as digits as its factorization.

44685139921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 52.

The spelling of 44685139921 in words is "forty-four billion, six hundred eighty-five million, one hundred thirty-nine thousand, nine hundred twenty-one".