21204852480 has 216 divisors, whose sum is σ = 83847839712. Its totient is φ = 4846804992.

The previous prime is 21204852457. The next prime is 21204852481. The reversal of 21204852480 is 8425840212.

21204852480 is a `hidden beast` number, since 2 + 12 + 0 + 48 + 524 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204852481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50839 + ... + 212118.

Almost surely, 2^21204852480 is an apocalyptic number.

21204852480 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 21204852480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41923919856).

21204852480 is an abundant number, since it is smaller than the sum of its proper divisors (62642987232).

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

21204852480 is a wasteful number, since it uses less digits than its factorization.

21204852480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262991 (or 262974 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 36.

The spelling of 21204852480 in words is "twenty-one billion, two hundred four million, eight hundred fifty-two thousand, four hundred eighty".