2220621961 has 2 divisors, whose sum is σ = 2220621962. Its totient is φ = 2220621960.

The previous prime is 2220621943. The next prime is 2220621971. The reversal of 2220621961 is 1691260222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1602801225 + 617820736 = 40035^2 + 24856^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220621961 - 2⁵ = 2220621929 is a prime.

It is not a weakly prime, because it can be changed into another prime (2220621971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110310980 + 1110310981.

It is an arithmetic number, because the mean of its divisors is an integer number (1110310981).

Almost surely, 2^2220621961 is an apocalyptic number.

It is an amenable number.

2220621961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220621961 is an equidigital number, since it uses as much as digits as its factorization.

2220621961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 2220621961 is about 47123.4756888751. The cubic root of 2220621961 is about 1304.6425646257.

The spelling of 2220621961 in words is "two billion, two hundred twenty million, six hundred twenty-one thousand, nine hundred sixty-one".