23221000720 has 80 divisors (see below), whose sum is σ = 54834490368. Its totient is φ = 9143930880.

The previous prime is 23221000661. The next prime is 23221000741. The reversal of 23221000720 is 2700012232.

It is a tau number, because it is divible by the number of its divisors (80).

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, 1474327 + ... + 1489993.

Almost surely, 2^23221000720 is an apocalyptic number.

23221000720 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 23221000720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27417245184).

23221000720 is an abundant number, since it is smaller than the sum of its proper divisors (31613489648).

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

23221000720 is a wasteful number, since it uses less digits than its factorization.

23221000720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15968 (or 15962 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

Adding to 23221000720 its reverse (2700012232), we get a palindrome (25921012952).

The spelling of 23221000720 in words is "twenty-three billion, two hundred twenty-one million, seven hundred twenty", and thus it is an aban number.