23211322121 has 4 divisors (see below), whose sum is σ = 24996808452. Its totient is φ = 21425835792.

The previous prime is 23211322109. The next prime is 23211322129. The reversal of 23211322121 is 12122311232.

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 12527205625 + 10684116496 = 111925^2 + 103364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23211322121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23211322093 and 23211322102.

It is not an unprimeable number, because it can be changed into a prime (23211322129) 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, 892743146 + ... + 892743171.

It is an arithmetic number, because the mean of its divisors is an integer number (6249202113).

Almost surely, 2^23211322121 is an apocalyptic number.

It is an amenable number.

23211322121 is a deficient number, since it is larger than the sum of its proper divisors (1785486331).

23211322121 is a wasteful number, since it uses less digits than its factorization.

23211322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785486330.

The product of its digits is 288, while the sum is 20.

Adding to 23211322121 its reverse (12122311232), we get a palindrome (35333633353).

The spelling of 23211322121 in words is "twenty-three billion, two hundred eleven million, three hundred twenty-two thousand, one hundred twenty-one".