11122222121 has 8 divisors (see below), whose sum is σ = 11187269184. Its totient is φ = 11057214960.

The previous prime is 11122222099. The next prime is 11122222157. The reversal of 11122222121 is 12122222111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11122222121 - 2⁶ = 11122222057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11122222121.

It is not an unprimeable number, because it can be changed into a prime (11122222021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691250 + ... + 707156.

It is an arithmetic number, because the mean of its divisors is an integer number (1398408648).

Almost surely, 2^11122222121 is an apocalyptic number.

It is an amenable number.

11122222121 is a deficient number, since it is larger than the sum of its proper divisors (65047063).

11122222121 is a wasteful number, since it uses less digits than its factorization.

11122222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19951.

The product of its digits is 64, while the sum is 17.

Adding to 11122222121 its reverse (12122222111), we get a palindrome (23244444232).

The spelling of 11122222121 in words is "eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".