221253401 has 2 divisors, whose sum is σ = 221253402. Its totient is φ = 221253400.

The previous prime is 221253391. The next prime is 221253413. The reversal of 221253401 is 104352122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190992400 + 30261001 = 13820^2 + 5501^2 .

It is a cyclic number.

It is not a de Polignac number, because 221253401 - 2⁶ = 221253337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221253421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110626700 + 110626701.

It is an arithmetic number, because the mean of its divisors is an integer number (110626701).

Almost surely, 2^221253401 is an apocalyptic number.

It is an amenable number.

221253401 is a deficient number, since it is larger than the sum of its proper divisors (1).

221253401 is an equidigital number, since it uses as much as digits as its factorization.

221253401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 221253401 is about 14874.5891035685. The cubic root of 221253401 is about 604.8253494914.

The spelling of 221253401 in words is "two hundred twenty-one million, two hundred fifty-three thousand, four hundred one".