2115340021 has 2 divisors, whose sum is σ = 2115340022. Its totient is φ = 2115340020.

The previous prime is 2115339959. The next prime is 2115340043. The reversal of 2115340021 is 1200435112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1834408900 + 280931121 = 42830^2 + 16761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115340021 - 2¹⁵ = 2115307253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2115346021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057670010 + 1057670011.

It is an arithmetic number, because the mean of its divisors is an integer number (1057670011).

Almost surely, 2^2115340021 is an apocalyptic number.

It is an amenable number.

2115340021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115340021 is an equidigital number, since it uses as much as digits as its factorization.

2115340021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2115340021 is about 45992.8257557633. The cubic root of 2115340021 is about 1283.6897161839.

Adding to 2115340021 its reverse (1200435112), we get a palindrome (3315775133).

The spelling of 2115340021 in words is "two billion, one hundred fifteen million, three hundred forty thousand, twenty-one".