2217915121 has 2 divisors, whose sum is σ = 2217915122. Its totient is φ = 2217915120.

The previous prime is 2217915113. The next prime is 2217915169. The reversal of 2217915121 is 1215197122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1335171600 + 882743521 = 36540^2 + 29711^2 .

It is a cyclic number.

It is not a de Polignac number, because 2217915121 - 2³ = 2217915113 is a prime.

It is not a weakly prime, because it can be changed into another prime (2217915191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108957560 + 1108957561.

It is an arithmetic number, because the mean of its divisors is an integer number (1108957561).

Almost surely, 2^2217915121 is an apocalyptic number.

It is an amenable number.

2217915121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217915121 is an equidigital number, since it uses as much as digits as its factorization.

2217915121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 31.

The square root of 2217915121 is about 47094.7462144133. The cubic root of 2217915121 is about 1304.1122485534.

The spelling of 2217915121 in words is "two billion, two hundred seventeen million, nine hundred fifteen thousand, one hundred twenty-one".