221111220013 has 2 divisors, whose sum is σ = 221111220014. Its totient is φ = 221111220012.

The previous prime is 221111219971. The next prime is 221111220017. The reversal of 221111220013 is 310022111122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221071113124 + 40106889 = 470182^2 + 6333^2 .

It is a cyclic number.

It is not a de Polignac number, because 221111220013 - 2⁹ = 221111219501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221111220017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555610006 + 110555610007.

It is an arithmetic number, because the mean of its divisors is an integer number (110555610007).

Almost surely, 2^221111220013 is an apocalyptic number.

It is an amenable number.

221111220013 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111220013 is an equidigital number, since it uses as much as digits as its factorization.

221111220013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 221111220013 its reverse (310022111122), we get a palindrome (531133331135).

The spelling of 221111220013 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twenty thousand, thirteen".