23012121131 has 4 divisors (see below), whose sum is σ = 23013454872. Its totient is φ = 23010787392.

The previous prime is 23012121079. The next prime is 23012121133. The reversal of 23012121131 is 13112121032.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23012121131 is a prime.

It is a super-2 number, since 2×23012121131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23012121133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640646 + ... + 675611.

It is an arithmetic number, because the mean of its divisors is an integer number (5753363718).

Almost surely, 2^23012121131 is an apocalyptic number.

23012121131 is a deficient number, since it is larger than the sum of its proper divisors (1333741).

23012121131 is a wasteful number, since it uses less digits than its factorization.

23012121131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333740.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 23012121131 its reverse (13112121032), we get a palindrome (36124242163).

Subtracting from 23012121131 its reverse (13112121032), we obtain a palindrome (9900000099).

The spelling of 23012121131 in words is "twenty-three billion, twelve million, one hundred twenty-one thousand, one hundred thirty-one".