23221211640 has 160 divisors (see below), whose sum is σ = 76635320400. Its totient is φ = 5628958720.

The previous prime is 23221211639. The next prime is 23221211747. The reversal of 23221211640 is 4611212232.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 23221211640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1750312 + ... + 1763528.

Almost surely, 2^23221211640 is an apocalyptic number.

23221211640 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 23221211640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38317660200).

23221211640 is an abundant number, since it is smaller than the sum of its proper divisors (53414108760).

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

23221211640 is a wasteful number, since it uses less digits than its factorization.

23221211640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13275 (or 13238 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 23221211640 its reverse (4611212232), we get a palindrome (27832423872).

The spelling of 23221211640 in words is "twenty-three billion, two hundred twenty-one million, two hundred eleven thousand, six hundred forty".