18830029921 has 2 divisors, whose sum is σ = 18830029922. Its totient is φ = 18830029920.

The previous prime is 18830029913. The next prime is 18830029949. The reversal of 18830029921 is 12992003881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15101706321 + 3728323600 = 122889^2 + 61060^2 .

It is a cyclic number.

It is not a de Polignac number, because 18830029921 - 2³ = 18830029913 is a prime.

It is not a weakly prime, because it can be changed into another prime (18830029961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9415014960 + 9415014961.

It is an arithmetic number, because the mean of its divisors is an integer number (9415014961).

Almost surely, 2^18830029921 is an apocalyptic number.

It is an amenable number.

18830029921 is a deficient number, since it is larger than the sum of its proper divisors (1).

18830029921 is an equidigital number, since it uses as much as digits as its factorization.

18830029921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 18830029921 in words is "eighteen billion, eight hundred thirty million, twenty-nine thousand, nine hundred twenty-one".