10221217961 has 2 divisors, whose sum is σ = 10221217962. Its totient is φ = 10221217960.

The previous prime is 10221217931. The next prime is 10221217973. The reversal of 10221217961 is 16971212201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7912992025 + 2308225936 = 88955^2 + 48044^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221217961 - 2¹⁴ = 10221201577 is a prime.

It is not a weakly prime, because it can be changed into another prime (10221217931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110608980 + 5110608981.

It is an arithmetic number, because the mean of its divisors is an integer number (5110608981).

Almost surely, 2^10221217961 is an apocalyptic number.

It is an amenable number.

10221217961 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221217961 is an equidigital number, since it uses as much as digits as its factorization.

10221217961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The spelling of 10221217961 in words is "ten billion, two hundred twenty-one million, two hundred seventeen thousand, nine hundred sixty-one".