221202100997 has 2 divisors, whose sum is σ = 221202100998. Its totient is φ = 221202100996.

The previous prime is 221202100969. The next prime is 221202101033. The reversal of 221202100997 is 799001202122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219273046756 + 1929054241 = 468266^2 + 43921^2 .

It is a cyclic number.

It is not a de Polignac number, because 221202100997 - 2⁸ = 221202100741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221202000997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110601050498 + 110601050499.

It is an arithmetic number, because the mean of its divisors is an integer number (110601050499).

Almost surely, 2^221202100997 is an apocalyptic number.

It is an amenable number.

221202100997 is a deficient number, since it is larger than the sum of its proper divisors (1).

221202100997 is an equidigital number, since it uses as much as digits as its factorization.

221202100997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 221202100997 in words is "two hundred twenty-one billion, two hundred two million, one hundred thousand, nine hundred ninety-seven".