2217346921 has 2 divisors, whose sum is σ = 2217346922. Its totient is φ = 2217346920.

The previous prime is 2217346903. The next prime is 2217346933. The reversal of 2217346921 is 1296437122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1319505625 + 897841296 = 36325^2 + 29964^2 .

It is a cyclic number.

It is not a de Polignac number, because 2217346921 - 2⁷ = 2217346793 is a prime.

It is not a weakly prime, because it can be changed into another prime (2217346961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108673460 + 1108673461.

It is an arithmetic number, because the mean of its divisors is an integer number (1108673461).

Almost surely, 2^2217346921 is an apocalyptic number.

It is an amenable number.

2217346921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217346921 is an equidigital number, since it uses as much as digits as its factorization.

2217346921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 2217346921 is about 47088.7133079680. The cubic root of 2217346921 is about 1304.0008737072. Note that the first 3 decimals are identical.

The spelling of 2217346921 in words is "two billion, two hundred seventeen million, three hundred forty-six thousand, nine hundred twenty-one".