11213222121 has 28 divisors (see below), whose sum is σ = 16906261680. Its totient is φ = 7433632440.

The previous prime is 11213222107. The next prime is 11213222123. The reversal of 11213222121 is 12122231211.

It is not a de Polignac number, because 11213222121 - 2⁵ = 11213222089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11213222094 and 11213222103.

It is not an unprimeable number, because it can be changed into a prime (11213222123) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 87526 + ... + 173456.

It is an arithmetic number, because the mean of its divisors is an integer number (603795060).

Almost surely, 2^11213222121 is an apocalyptic number.

It is an amenable number.

11213222121 is a deficient number, since it is larger than the sum of its proper divisors (5693039559).

11213222121 is an frugal number, since it uses more digits than its factorization.

11213222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86128 (or 86113 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 11213222121 its reverse (12122231211), we get a palindrome (23335453332).

The spelling of 11213222121 in words is "eleven billion, two hundred thirteen million, two hundred twenty-two thousand, one hundred twenty-one".