21425079600 has 720 divisors, whose sum is σ = 84969990144. Its totient is φ = 4967424000.

The previous prime is 21425079589. The next prime is 21425079607. The reversal of 21425079600 is 697052412.

21425079600 is a `hidden beast` number, since 2 + 1 + 42 + 5 + 0 + 7 + 9 + 600 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

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

It is not an unprimeable number, because it can be changed into a prime (21425079607) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 43635355 + ... + 43635845.

Almost surely, 2^21425079600 is an apocalyptic number.

21425079600 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 21425079600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42484995072).

21425079600 is an abundant number, since it is smaller than the sum of its proper divisors (63544910544).

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

21425079600 is a wasteful number, since it uses less digits than its factorization.

21425079600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586 (or 572 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 21425079600 in words is "twenty-one billion, four hundred twenty-five million, seventy-nine thousand, six hundred".