221404013 has 2 divisors, whose sum is σ = 221404014. Its totient is φ = 221404012.

The previous prime is 221403991. The next prime is 221404021. The reversal of 221404013 is 310404122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182304004 + 39100009 = 13502^2 + 6253^2 .

It is a cyclic number.

It is not a de Polignac number, because 221404013 - 2¹² = 221399917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221403982 and 221404000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221404063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110702006 + 110702007.

It is an arithmetic number, because the mean of its divisors is an integer number (110702007).

Almost surely, 2^221404013 is an apocalyptic number.

It is an amenable number.

221404013 is a deficient number, since it is larger than the sum of its proper divisors (1).

221404013 is an equidigital number, since it uses as much as digits as its factorization.

221404013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 221404013 is about 14879.6509703689. The cubic root of 221404013 is about 604.9625576172.

Adding to 221404013 its reverse (310404122), we get a palindrome (531808135).

The spelling of 221404013 in words is "two hundred twenty-one million, four hundred four thousand, thirteen".