202221019961 has 2 divisors, whose sum is σ = 202221019962. Its totient is φ = 202221019960.

The previous prime is 202221019939. The next prime is 202221019981. The reversal of 202221019961 is 169910122202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129715225600 + 72505794361 = 360160^2 + 269269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202221019961 is a prime.

It is not a weakly prime, because it can be changed into another prime (202221019901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101110509980 + 101110509981.

It is an arithmetic number, because the mean of its divisors is an integer number (101110509981).

Almost surely, 2^202221019961 is an apocalyptic number.

It is an amenable number.

202221019961 is a deficient number, since it is larger than the sum of its proper divisors (1).

202221019961 is an equidigital number, since it uses as much as digits as its factorization.

202221019961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 202221019961 in words is "two hundred two billion, two hundred twenty-one million, nineteen thousand, nine hundred sixty-one".