11122220121 has 4 divisors (see below), whose sum is σ = 14829626832. Its totient is φ = 7414813412.

The previous prime is 11122220119. The next prime is 11122220141. The reversal of 11122220121 is 12102222111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11122220121 - 2¹ = 11122220119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11122220121.

It is not an unprimeable number, because it can be changed into a prime (11122220141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1853703351 + ... + 1853703356.

It is an arithmetic number, because the mean of its divisors is an integer number (3707406708).

Almost surely, 2^11122220121 is an apocalyptic number.

It is an amenable number.

11122220121 is a deficient number, since it is larger than the sum of its proper divisors (3707406711).

11122220121 is an equidigital number, since it uses as much as digits as its factorization.

11122220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3707406710.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11122220121 its reverse (12102222111), we get a palindrome (23224442232).

The spelling of 11122220121 in words is "eleven billion, one hundred twenty-two million, two hundred twenty thousand, one hundred twenty-one".