21460015500 has 864 divisors, whose sum is σ = 84771348480. Its totient is φ = 4191264000.

The previous prime is 21460015487. The next prime is 21460015541. The reversal of 21460015500 is 551006412.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 168976437 + ... + 168976563.

Almost surely, 2^21460015500 is an apocalyptic number.

21460015500 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 21460015500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42385674240).

21460015500 is an abundant number, since it is smaller than the sum of its proper divisors (63311332980).

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

21460015500 is a wasteful number, since it uses less digits than its factorization.

21460015500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 21460015500 in words is "twenty-one billion, four hundred sixty million, fifteen thousand, five hundred".