221120102221961 has 2 divisors, whose sum is σ = 221120102221962. Its totient is φ = 221120102221960.

The previous prime is 221120102221951. The next prime is 221120102222023. The reversal of 221120102221961 is 169122201021122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218417510892025 + 2702591329936 = 14778955^2 + 1643956^2 .

It is a cyclic number.

It is not a de Polignac number, because 221120102221961 - 2³⁰ = 221119028480137 is a prime.

It is not a weakly prime, because it can be changed into another prime (221120102221951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560051110980 + 110560051110981.

It is an arithmetic number, because the mean of its divisors is an integer number (110560051110981).

Almost surely, 2^{221120102221961} is an apocalyptic number.

It is an amenable number.

221120102221961 is a deficient number, since it is larger than the sum of its proper divisors (1).

221120102221961 is an equidigital number, since it uses as much as digits as its factorization.

221120102221961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 32.

The spelling of 221120102221961 in words is "two hundred twenty-one trillion, one hundred twenty billion, one hundred two million, two hundred twenty-one thousand, nine hundred sixty-one".