23253221520 has 240 divisors, whose sum is σ = 85354394112. Its totient is φ = 5647749120.

The previous prime is 23253221483. The next prime is 23253221521. The reversal of 23253221520 is 2512235232.

23253221520 is a `hidden beast` number, since 2 + 325 + 322 + 15 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×23253221520² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23253221521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 348799 + ... + 410081.

Almost surely, 2^23253221520 is an apocalyptic number.

23253221520 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 23253221520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42677197056).

23253221520 is an abundant number, since it is smaller than the sum of its proper divisors (62101172592).

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

23253221520 is a wasteful number, since it uses less digits than its factorization.

23253221520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61350 (or 61341 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 23253221520 its reverse (2512235232), we get a palindrome (25765456752).

The spelling of 23253221520 in words is "twenty-three billion, two hundred fifty-three million, two hundred twenty-one thousand, five hundred twenty".