23211112121 has 4 divisors (see below), whose sum is σ = 23213312244. Its totient is φ = 23208912000.

The previous prime is 23211112117. The next prime is 23211112123. The reversal of 23211112121 is 12121111232.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20610622096 + 2600490025 = 143564^2 + 50995^2 .

It is a cyclic number.

It is not a de Polignac number, because 23211112121 - 2² = 23211112117 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 23211112121.

It is not an unprimeable number, because it can be changed into a prime (23211112123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1084160 + ... + 1105361.

It is an arithmetic number, because the mean of its divisors is an integer number (5803328061).

Almost surely, 2^23211112121 is an apocalyptic number.

It is an amenable number.

23211112121 is a deficient number, since it is larger than the sum of its proper divisors (2200123).

23211112121 is a wasteful number, since it uses less digits than its factorization.

23211112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200122.

The product of its digits is 48, while the sum is 17.

Adding to 23211112121 its reverse (12121111232), we get a palindrome (35332223353).

It can be divided in two parts, 2321111 and 2121, that added together give a palindrome (2323232).

The spelling of 23211112121 in words is "twenty-three billion, two hundred eleven million, one hundred twelve thousand, one hundred twenty-one".