21488100504 has 128 divisors (see below), whose sum is σ = 61579284480. Its totient is φ = 6189926400.

The previous prime is 21488100479. The next prime is 21488100509. The reversal of 21488100504 is 40500188412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21488100509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1002459 + ... + 1023669.

It is an arithmetic number, because the mean of its divisors is an integer number (481088160).

Almost surely, 2^21488100504 is an apocalyptic number.

21488100504 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 21488100504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30789642240).

21488100504 is an abundant number, since it is smaller than the sum of its proper divisors (40091183976).

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

21488100504 is a wasteful number, since it uses less digits than its factorization.

21488100504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21441 (or 21437 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 33.

Adding to 21488100504 its reverse (40500188412), we get a palindrome (61988288916).

The spelling of 21488100504 in words is "twenty-one billion, four hundred eighty-eight million, one hundred thousand, five hundred four".