21204552000 has 224 divisors, whose sum is σ = 71912805120. Its totient is φ = 5501491200.

The previous prime is 21204551983. The next prime is 21204552023. The reversal of 21204552000 is 25540212.

It is a happy number.

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, 876061 + ... + 899939.

Almost surely, 2^21204552000 is an apocalyptic number.

21204552000 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 21204552000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35956402560).

21204552000 is an abundant number, since it is smaller than the sum of its proper divisors (50708253120).

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

21204552000 is a wasteful number, since it uses less digits than its factorization.

21204552000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23946 (or 23926 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The spelling of 21204552000 in words is "twenty-one billion, two hundred four million, five hundred fifty-two thousand".