11221124921 has 2 divisors, whose sum is σ = 11221124922. Its totient is φ = 11221124920.

The previous prime is 11221124909. The next prime is 11221124969. The reversal of 11221124921 is 12942112211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9932314921 + 1288810000 = 99661^2 + 35900^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221124921 - 2²⁶ = 11154016057 is a prime.

It is not a weakly prime, because it can be changed into another prime (11221126921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610562460 + 5610562461.

It is an arithmetic number, because the mean of its divisors is an integer number (5610562461).

Almost surely, 2^11221124921 is an apocalyptic number.

It is an amenable number.

11221124921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221124921 is an equidigital number, since it uses as much as digits as its factorization.

11221124921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 26.

The spelling of 11221124921 in words is "eleven billion, two hundred twenty-one million, one hundred twenty-four thousand, nine hundred twenty-one".