221401073 has 2 divisors, whose sum is σ = 221401074. Its totient is φ = 221401072.

The previous prime is 221401057. The next prime is 221401079. The reversal of 221401073 is 370104122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199713424 + 21687649 = 14132^2 + 4657^2 .

It is a cyclic number.

It is not a de Polignac number, because 221401073 - 2⁴ = 221401057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221401079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110700536 + 110700537.

It is an arithmetic number, because the mean of its divisors is an integer number (110700537).

Almost surely, 2^221401073 is an apocalyptic number.

It is an amenable number.

221401073 is a deficient number, since it is larger than the sum of its proper divisors (1).

221401073 is an equidigital number, since it uses as much as digits as its factorization.

221401073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 221401073 is about 14879.5521774010. The cubic root of 221401073 is about 604.9598798612.

Adding to 221401073 its reverse (370104122), we get a palindrome (591505195).

The spelling of 221401073 in words is "two hundred twenty-one million, four hundred one thousand, seventy-three".