23131032221 has 16 divisors (see below), whose sum is σ = 26172488448. Its totient is φ = 20257272000.

The previous prime is 23131032191. The next prime is 23131032227. The reversal of 23131032221 is 12223013132.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23131032221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23131032193 and 23131032202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131032227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240245 + ... + 322458.

It is an arithmetic number, because the mean of its divisors is an integer number (1635780528).

Almost surely, 2^23131032221 is an apocalyptic number.

It is an amenable number.

23131032221 is a deficient number, since it is larger than the sum of its proper divisors (3041456227).

23131032221 is a wasteful number, since it uses less digits than its factorization.

23131032221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562852.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 23131032221 its reverse (12223013132), we get a palindrome (35354045353).

The spelling of 23131032221 in words is "twenty-three billion, one hundred thirty-one million, thirty-two thousand, two hundred twenty-one".