23311211331 has 4 divisors (see below), whose sum is σ = 31081615112. Its totient is φ = 15540807552.

The previous prime is 23311211327. The next prime is 23311211351. The reversal of 23311211331 is 13311211332.

It is a happy number.

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

It is not a de Polignac number, because 23311211331 - 2² = 23311211327 is a prime.

It is a super-2 number, since 2×23311211331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23311211298 and 23311211307.

It is not an unprimeable number, because it can be changed into a prime (23311211351) 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, 3885201886 + ... + 3885201891.

It is an arithmetic number, because the mean of its divisors is an integer number (7770403778).

Almost surely, 2^23311211331 is an apocalyptic number.

23311211331 is a deficient number, since it is larger than the sum of its proper divisors (7770403781).

23311211331 is an equidigital number, since it uses as much as digits as its factorization.

23311211331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7770403780.

The product of its digits is 324, while the sum is 21.

Adding to 23311211331 its reverse (13311211332), we get a palindrome (36622422663).

Subtracting from 23311211331 its reverse (13311211332), we obtain a palindrome (9999999999).

The spelling of 23311211331 in words is "twenty-three billion, three hundred eleven million, two hundred eleven thousand, three hundred thirty-one".