215365121 has 2 divisors, whose sum is σ = 215365122. Its totient is φ = 215365120.

The previous prime is 215365093. The next prime is 215365127. The reversal of 215365121 is 121563512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181306225 + 34058896 = 13465^2 + 5836^2 .

It is a cyclic number.

It is not a de Polignac number, because 215365121 - 2²⁶ = 148256257 is a prime.

It is not a weakly prime, because it can be changed into another prime (215365127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107682560 + 107682561.

It is an arithmetic number, because the mean of its divisors is an integer number (107682561).

Almost surely, 2^215365121 is an apocalyptic number.

It is an amenable number.

215365121 is a deficient number, since it is larger than the sum of its proper divisors (1).

215365121 is an equidigital number, since it uses as much as digits as its factorization.

215365121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 26.

The square root of 215365121 is about 14675.3235398747. The cubic root of 215365121 is about 599.4115721839.

The spelling of 215365121 in words is "two hundred fifteen million, three hundred sixty-five thousand, one hundred twenty-one".