221052401 has 2 divisors, whose sum is σ = 221052402. Its totient is φ = 221052400.

The previous prime is 221052397. The next prime is 221052439. The reversal of 221052401 is 104250122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141039376 + 80013025 = 11876^2 + 8945^2 .

It is a cyclic number.

It is not a de Polignac number, because 221052401 - 2² = 221052397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221052401.

It is not a weakly prime, because it can be changed into another prime (221052101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110526200 + 110526201.

It is an arithmetic number, because the mean of its divisors is an integer number (110526201).

Almost surely, 2^221052401 is an apocalyptic number.

It is an amenable number.

221052401 is a deficient number, since it is larger than the sum of its proper divisors (1).

221052401 is an equidigital number, since it uses as much as digits as its factorization.

221052401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 221052401 is about 14867.8310792126. The cubic root of 221052401 is about 604.6421406652.

The spelling of 221052401 in words is "two hundred twenty-one million, fifty-two thousand, four hundred one".