23221331220 has 48 divisors (see below), whose sum is σ = 68844420288. Its totient is φ = 5828098560.

The previous prime is 23221331183. The next prime is 23221331249. The reversal of 23221331220 is 2213312232.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11381986 + ... + 11384025.

It is an arithmetic number, because the mean of its divisors is an integer number (1434258756).

Almost surely, 2^23221331220 is an apocalyptic number.

23221331220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23221331220 is an abundant number, since it is smaller than the sum of its proper divisors (45623089068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23221331220 is a wasteful number, since it uses less digits than its factorization.

23221331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22766040 (or 22766038 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 23221331220 its reverse (2213312232), we get a palindrome (25434643452).

The spelling of 23221331220 in words is "twenty-three billion, two hundred twenty-one million, three hundred thirty-one thousand, two hundred twenty".