221313401 has 2 divisors, whose sum is σ = 221313402. Its totient is φ = 221313400.

The previous prime is 221313377. The next prime is 221313427. The reversal of 221313401 is 104313122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201072400 + 20241001 = 14180^2 + 4499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221313401 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221313401.

It is not a weakly prime, because it can be changed into another prime (221313101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110656700 + 110656701.

It is an arithmetic number, because the mean of its divisors is an integer number (110656701).

Almost surely, 2^221313401 is an apocalyptic number.

It is an amenable number.

221313401 is a deficient number, since it is larger than the sum of its proper divisors (1).

221313401 is an equidigital number, since it uses as much as digits as its factorization.

221313401 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 17.

The square root of 221313401 is about 14876.6058292878. The cubic root of 221313401 is about 604.8800171875.

Adding to 221313401 its reverse (104313122), we get a palindrome (325626523).

The spelling of 221313401 in words is "two hundred twenty-one million, three hundred thirteen thousand, four hundred one".