44422640921 has 2 divisors, whose sum is σ = 44422640922. Its totient is φ = 44422640920.

The previous prime is 44422640893. The next prime is 44422640947. The reversal of 44422640921 is 12904622444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44421463696 + 1177225 = 210764^2 + 1085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44422640921 is a prime.

It is a super-2 number, since 2×44422640921² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (44422640971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22211320460 + 22211320461.

It is an arithmetic number, because the mean of its divisors is an integer number (22211320461).

Almost surely, 2^44422640921 is an apocalyptic number.

It is an amenable number.

44422640921 is a deficient number, since it is larger than the sum of its proper divisors (1).

44422640921 is an equidigital number, since it uses as much as digits as its factorization.

44422640921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 38.

The spelling of 44422640921 in words is "forty-four billion, four hundred twenty-two million, six hundred forty thousand, nine hundred twenty-one".