215114621 has 2 divisors, whose sum is σ = 215114622. Its totient is φ = 215114620.

The previous prime is 215114591. The next prime is 215114623. The reversal of 215114621 is 126411512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119661721 + 95452900 = 10939^2 + 9770^2 .

It is a cyclic number.

It is not a de Polignac number, because 215114621 - 2¹⁴ = 215098237 is a prime.

It is a Sophie Germain prime.

Together with 215114623, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215114623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107557310 + 107557311.

It is an arithmetic number, because the mean of its divisors is an integer number (107557311).

Almost surely, 2^215114621 is an apocalyptic number.

It is an amenable number.

215114621 is a deficient number, since it is larger than the sum of its proper divisors (1).

215114621 is an equidigital number, since it uses as much as digits as its factorization.

215114621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 23.

The square root of 215114621 is about 14666.7863214816. The cubic root of 215114621 is about 599.1790819645.

The spelling of 215114621 in words is "two hundred fifteen million, one hundred fourteen thousand, six hundred twenty-one".