221910262961 has 2 divisors, whose sum is σ = 221910262962. Its totient is φ = 221910262960.

The previous prime is 221910262907. The next prime is 221910262967. The reversal of 221910262961 is 169262019122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114552463936 + 107357799025 = 338456^2 + 327655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221910262961 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221910262967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110955131480 + 110955131481.

It is an arithmetic number, because the mean of its divisors is an integer number (110955131481).

Almost surely, 2^221910262961 is an apocalyptic number.

It is an amenable number.

221910262961 is a deficient number, since it is larger than the sum of its proper divisors (1).

221910262961 is an equidigital number, since it uses as much as digits as its factorization.

221910262961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The spelling of 221910262961 in words is "two hundred twenty-one billion, nine hundred ten million, two hundred sixty-two thousand, nine hundred sixty-one".