23221201500 has 672 divisors, whose sum is σ = 91665100800. Its totient is φ = 5017852800.

The previous prime is 23221201469. The next prime is 23221201501. The reversal of 23221201500 is 510212232.

23221201500 is a `hidden beast` number, since 23 + 22 + 120 + 1 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23221201501) by changing a digit.

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 223 ways as a sum of consecutive naturals, for example, 48478261 + ... + 48478739.

It is an arithmetic number, because the mean of its divisors is an integer number (136406400).

Almost surely, 2^23221201500 is an apocalyptic number.

23221201500 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 23221201500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45832550400).

23221201500 is an abundant number, since it is smaller than the sum of its proper divisors (68443899300).

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

23221201500 is a wasteful number, since it uses less digits than its factorization.

23221201500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 23221201500 its reverse (510212232), we get a palindrome (23731413732).

The spelling of 23221201500 in words is "twenty-three billion, two hundred twenty-one million, two hundred one thousand, five hundred".