21487473600 has 168 divisors, whose sum is σ = 70625055600. Its totient is φ = 5719572480.

The previous prime is 21487473577. The next prime is 21487473613. The reversal of 21487473600 is 637478412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2842626 + ... + 2850174.

Almost surely, 2^21487473600 is an apocalyptic number.

21487473600 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 21487473600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35312527800).

21487473600 is an abundant number, since it is smaller than the sum of its proper divisors (49137582000).

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

21487473600 is a wasteful number, since it uses less digits than its factorization.

21487473600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8167 (or 8152 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The spelling of 21487473600 in words is "twenty-one billion, four hundred eighty-seven million, four hundred seventy-three thousand, six hundred".