11012111221 has 2 divisors, whose sum is σ = 11012111222. Its totient is φ = 11012111220.

The previous prime is 11012111213. The next prime is 11012111269. The reversal of 11012111221 is 12211121011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10123176996 + 888934225 = 100614^2 + 29815^2 .

It is a cyclic number.

It is not a de Polignac number, because 11012111221 - 2³ = 11012111213 is a prime.

It is a super-2 number, since 2×11012111221² (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 (11012111291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5506055610 + 5506055611.

It is an arithmetic number, because the mean of its divisors is an integer number (5506055611).

Almost surely, 2^11012111221 is an apocalyptic number.

It is an amenable number.

11012111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11012111221 is an equidigital number, since it uses as much as digits as its factorization.

11012111221 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 11012111221 its reverse (12211121011), we get a palindrome (23223232232).

The spelling of 11012111221 in words is "eleven billion, twelve million, one hundred eleven thousand, two hundred twenty-one".