2115238921 has 2 divisors, whose sum is σ = 2115238922. Its totient is φ = 2115238920.

The previous prime is 2115238837. The next prime is 2115238927. The reversal of 2115238921 is 1298325112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2093977600 + 21261321 = 45760^2 + 4611^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115238921 - 2²⁵ = 2081684489 is a prime.

It is not a weakly prime, because it can be changed into another prime (2115238927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057619460 + 1057619461.

It is an arithmetic number, because the mean of its divisors is an integer number (1057619461).

Almost surely, 2^2115238921 is an apocalyptic number.

It is an amenable number.

2115238921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115238921 is an equidigital number, since it uses as much as digits as its factorization.

2115238921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The square root of 2115238921 is about 45991.7266581719. The cubic root of 2115238921 is about 1283.6692650828.

The spelling of 2115238921 in words is "two billion, one hundred fifteen million, two hundred thirty-eight thousand, nine hundred twenty-one".