21305462400 has 336 divisors, whose sum is σ = 78919267110. Its totient is φ = 5680834560.

The previous prime is 21305462357. The next prime is 21305462407. The reversal of 21305462400 is 426450312.

21305462400 is a `hidden beast` number, since 2 + 1 + 30 + 5 + 4 + 624 + 0 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 18459026496 + 2846435904 = 135864^2 + 53352^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21305462407) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 2328234 + ... + 2337366.

Almost surely, 2^21305462400 is an apocalyptic number.

21305462400 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 21305462400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39459633555).

21305462400 is an abundant number, since it is smaller than the sum of its proper divisors (57613804710).

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

21305462400 is an frugal number, since it uses more digits than its factorization.

21305462400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9175 (or 9143 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The spelling of 21305462400 in words is "twenty-one billion, three hundred five million, four hundred sixty-two thousand, four hundred".