2115305021 has 2 divisors, whose sum is σ = 2115305022. Its totient is φ = 2115305020.

The previous prime is 2115305011. The next prime is 2115305029. The reversal of 2115305021 is 1205035112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1663742521 + 451562500 = 40789^2 + 21250^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115305021 - 2²² = 2111110717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2115304984 and 2115305002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2115305029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057652510 + 1057652511.

It is an arithmetic number, because the mean of its divisors is an integer number (1057652511).

Almost surely, 2^2115305021 is an apocalyptic number.

It is an amenable number.

2115305021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115305021 is an equidigital number, since it uses as much as digits as its factorization.

2115305021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2115305021 is about 45992.4452600642. The cubic root of 2115305021 is about 1283.6826362523.

The spelling of 2115305021 in words is "two billion, one hundred fifteen million, three hundred five thousand, twenty-one".