21118524504 has 192 divisors, whose sum is σ = 67347624960. Its totient is φ = 5456828160.

The previous prime is 21118524503. The next prime is 21118524547. The reversal of 21118524504 is 40542581112.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21118524503) 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, 2544249 + ... + 2552535.

It is an arithmetic number, because the mean of its divisors is an integer number (350768880).

Almost surely, 2^21118524504 is an apocalyptic number.

21118524504 is a gapful number since it is divisible by the number (24) 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 21118524504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33673812480).

21118524504 is an abundant number, since it is smaller than the sum of its proper divisors (46229100456).

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

21118524504 is a wasteful number, since it uses less digits than its factorization.

21118524504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8518 (or 8507 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The spelling of 21118524504 in words is "twenty-one billion, one hundred eighteen million, five hundred twenty-four thousand, five hundred four".