23451211520 has 72 divisors (see below), whose sum is σ = 61279651440. Its totient is φ = 8527708160.

The previous prime is 23451211457. The next prime is 23451211547. The reversal of 23451211520 is 2511215432.

It is a self number, because there is not a number n which added to its sum of digits gives 23451211520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 818705 + ... + 846864.

It is an arithmetic number, because the mean of its divisors is an integer number (851106270).

Almost surely, 2^23451211520 is an apocalyptic number.

23451211520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23451211520 is an abundant number, since it is smaller than the sum of its proper divisors (37828439920).

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

23451211520 is a wasteful number, since it uses less digits than its factorization.

23451211520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665601 (or 1665587 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 23451211520 its reverse (2511215432), we get a palindrome (25962426952).

The spelling of 23451211520 in words is "twenty-three billion, four hundred fifty-one million, two hundred eleven thousand, five hundred twenty".