21433989600 has 216 divisors, whose sum is σ = 75831052752. Its totient is φ = 5696870400.

The previous prime is 21433989529. The next prime is 21433989617. The reversal of 21433989600 is 698933412.

It is a happy number.

21433989600 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 39 + 8 + 9 + 600 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2248845 + ... + 2258355.

Almost surely, 2^21433989600 is an apocalyptic number.

21433989600 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 21433989600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37915526376).

21433989600 is an abundant number, since it is smaller than the sum of its proper divisors (54397063152).

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

21433989600 is a wasteful number, since it uses less digits than its factorization.

21433989600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9850 (or 9834 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 21433989600 in words is "twenty-one billion, four hundred thirty-three million, nine hundred eighty-nine thousand, six hundred".