23521231221 has 8 divisors (see below), whose sum is σ = 32725191360. Its totient is φ = 14999045952.

The previous prime is 23521231189. The next prime is 23521231303. The reversal of 23521231221 is 12213212532.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23521231221 - 2⁵ = 23521231189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23521231191 and 23521231200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23521231021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170443636 + ... + 170443773.

It is an arithmetic number, because the mean of its divisors is an integer number (4090648920).

Almost surely, 2^23521231221 is an apocalyptic number.

It is an amenable number.

23521231221 is a deficient number, since it is larger than the sum of its proper divisors (9203960139).

23521231221 is a wasteful number, since it uses less digits than its factorization.

23521231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340887435.

The product of its digits is 1440, while the sum is 24.

Adding to 23521231221 its reverse (12213212532), we get a palindrome (35734443753).

The spelling of 23521231221 in words is "twenty-three billion, five hundred twenty-one million, two hundred thirty-one thousand, two hundred twenty-one".