11222122121 has 4 divisors (see below), whose sum is σ = 12825282432.
Its totient is φ = 9618961812.
The previous prime is 11222122117. The next prime is 11222122151. The reversal of 11222122121 is 12122122211.
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 11222122121 - 22 = 11222122117 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 11222122121.
It is not an unprimeable number, because it can be changed into a prime (11222122111) 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, 801580145 + ... + 801580158.
It is an arithmetic number, because the mean of its divisors is an integer number (3206320608).
Almost surely, 211222122121 is an apocalyptic number.
It is an amenable number.
11222122121 is a deficient number, since it is larger than the sum of its proper divisors (1603160311).
11222122121 is an equidigital number, since it uses as much as digits as its factorization.
11222122121 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1603160310.
The product of its digits is 64, while the sum is 17.
Adding to 11222122121 its reverse (12122122211), we get a palindrome (23344244332).
The spelling of 11222122121 in words is "eleven billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".