221202901 has 2 divisors, whose sum is σ = 221202902. Its totient is φ = 221202900.

The previous prime is 221202869. The next prime is 221202907. The reversal of 221202901 is 109202122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131446225 + 89756676 = 11465^2 + 9474^2 .

It is a cyclic number.

It is not a de Polignac number, because 221202901 - 2⁵ = 221202869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221202907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110601450 + 110601451.

It is an arithmetic number, because the mean of its divisors is an integer number (110601451).

Almost surely, 2^221202901 is an apocalyptic number.

It is an amenable number.

221202901 is a deficient number, since it is larger than the sum of its proper divisors (1).

221202901 is an equidigital number, since it uses as much as digits as its factorization.

221202901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 221202901 is about 14872.8914808117. The cubic root of 221202901 is about 604.7793298534.

The spelling of 221202901 in words is "two hundred twenty-one million, two hundred two thousand, nine hundred one".