2216566621 has 2 divisors, whose sum is σ = 2216566622. Its totient is φ = 2216566620.

The previous prime is 2216566609. The next prime is 2216566631. The reversal of 2216566621 is 1266656122.

2216566621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2148322500 + 68244121 = 46350^2 + 8261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2216566621 - 2⁵ = 2216566589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2216566601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108283310 + 1108283311.

It is an arithmetic number, because the mean of its divisors is an integer number (1108283311).

Almost surely, 2^2216566621 is an apocalyptic number.

It is an amenable number.

2216566621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2216566621 is an equidigital number, since it uses as much as digits as its factorization.

2216566621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 2216566621 is about 47080.4271539671. The cubic root of 2216566621 is about 1303.8478933966.

The spelling of 2216566621 in words is "two billion, two hundred sixteen million, five hundred sixty-six thousand, six hundred twenty-one".