221111121013 has 2 divisors, whose sum is σ = 221111121014. Its totient is φ = 221111121012.

The previous prime is 221111120987. The next prime is 221111121019. The reversal of 221111121013 is 310121111122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127421869444 + 93689251569 = 356962^2 + 306087^2 .

It is a cyclic number.

It is not a de Polignac number, because 221111121013 - 2⁵ = 221111120981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221111121019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555560506 + 110555560507.

It is an arithmetic number, because the mean of its divisors is an integer number (110555560507).

Almost surely, 2^221111121013 is an apocalyptic number.

It is an amenable number.

221111121013 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111121013 is an equidigital number, since it uses as much as digits as its factorization.

221111121013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 221111121013 its reverse (310121111122), we get a palindrome (531232232135).

The spelling of 221111121013 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, thirteen".