2220500921 has 2 divisors, whose sum is σ = 2220500922. Its totient is φ = 2220500920.

The previous prime is 2220500899. The next prime is 2220500923. The reversal of 2220500921 is 1290050222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1524121600 + 696379321 = 39040^2 + 26389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2220500921 is a prime.

It is a Sophie Germain prime.

Together with 2220500923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2220500923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110250460 + 1110250461.

It is an arithmetic number, because the mean of its divisors is an integer number (1110250461).

Almost surely, 2^2220500921 is an apocalyptic number.

It is an amenable number.

2220500921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220500921 is an equidigital number, since it uses as much as digits as its factorization.

2220500921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2220500921 is about 47122.1913858004. The cubic root of 2220500921 is about 1304.6188600348.

The spelling of 2220500921 in words is "two billion, two hundred twenty million, five hundred thousand, nine hundred twenty-one".