23221310420 has 96 divisors (see below), whose sum is σ = 61794544896. Its totient is φ = 7119129600.

The previous prime is 23221310419. The next prime is 23221310459. The reversal of 23221310420 is 2401312232.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 23221310392 and 23221310401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29657 + ... + 217536.

It is an arithmetic number, because the mean of its divisors is an integer number (643693176).

Almost surely, 2^23221310420 is an apocalyptic number.

23221310420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23221310420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30897272448).

23221310420 is an abundant number, since it is smaller than the sum of its proper divisors (38573234476).

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

23221310420 is a wasteful number, since it uses less digits than its factorization.

23221310420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247281 (or 247279 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 23221310420 its reverse (2401312232), we get a palindrome (25622622652).

The spelling of 23221310420 in words is "twenty-three billion, two hundred twenty-one million, three hundred ten thousand, four hundred twenty".