2115814621 has 2 divisors, whose sum is σ = 2115814622. Its totient is φ = 2115814620.

The previous prime is 2115814579. The next prime is 2115814633. The reversal of 2115814621 is 1264185112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1589616900 + 526197721 = 39870^2 + 22939^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115814621 - 2²⁵ = 2082260189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2115814661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057907310 + 1057907311.

It is an arithmetic number, because the mean of its divisors is an integer number (1057907311).

Almost surely, 2^2115814621 is an apocalyptic number.

It is an amenable number.

2115814621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115814621 is an equidigital number, since it uses as much as digits as its factorization.

2115814621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 31.

The square root of 2115814621 is about 45997.9849667352. The cubic root of 2115814621 is about 1283.7857123477.

Adding to 2115814621 its reverse (1264185112), we get a palindrome (3379999733).

The spelling of 2115814621 in words is "two billion, one hundred fifteen million, eight hundred fourteen thousand, six hundred twenty-one".