11102111221 has 2 divisors, whose sum is σ = 11102111222. Its totient is φ = 11102111220.

The previous prime is 11102111197. The next prime is 11102111227. The reversal of 11102111221 is 12211120111.

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., 10549344100 + 552767121 = 102710^2 + 23511^2 .

It is a cyclic number.

It is not a de Polignac number, because 11102111221 - 2²⁷ = 10967893493 is a prime.

It is a super-2 number, since 2×11102111221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11102111227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5551055610 + 5551055611.

It is an arithmetic number, because the mean of its divisors is an integer number (5551055611).

Almost surely, 2^11102111221 is an apocalyptic number.

It is an amenable number.

11102111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11102111221 is an equidigital number, since it uses as much as digits as its factorization.

11102111221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11102111221 its reverse (12211120111), we get a palindrome (23313231332).

The spelling of 11102111221 in words is "eleven billion, one hundred two million, one hundred eleven thousand, two hundred twenty-one".