21534104000 has 224 divisors, whose sum is σ = 56830325760. Its totient is φ = 8054784000.

The previous prime is 21534103999. The next prime is 21534104021. The reversal of 21534104000 is 40143512.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25975586 + ... + 25976414.

Almost surely, 2^21534104000 is an apocalyptic number.

21534104000 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 21534104000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28415162880).

21534104000 is an abundant number, since it is smaller than the sum of its proper divisors (35296221760).

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

21534104000 is a wasteful number, since it uses less digits than its factorization.

21534104000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1044 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21534104000 its reverse (40143512), we get a palindrome (21574247512).

The spelling of 21534104000 in words is "twenty-one billion, five hundred thirty-four million, one hundred four thousand".