5042550185921 has 2 divisors, whose sum is σ = 5042550185922. Its totient is φ = 5042550185920.

The previous prime is 5042550185909. The next prime is 5042550185947. The reversal of 5042550185921 is 1295810552405.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3046648066225 + 1995902119696 = 1745465^2 + 1412764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5042550185921 is a prime.

It is not a weakly prime, because it can be changed into another prime (5042550185521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2521275092960 + 2521275092961.

It is an arithmetic number, because the mean of its divisors is an integer number (2521275092961).

Almost surely, 2^{5042550185921} is an apocalyptic number.

It is an amenable number.

5042550185921 is a deficient number, since it is larger than the sum of its proper divisors (1).

5042550185921 is an equidigital number, since it uses as much as digits as its factorization.

5042550185921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720000, while the sum is 47.

The spelling of 5042550185921 in words is "five trillion, forty-two billion, five hundred fifty million, one hundred eighty-five thousand, nine hundred twenty-one".