21286250496 has 480 divisors, whose sum is σ = 75917761920. Its totient is φ = 5810061312.

The previous prime is 21286250459. The next prime is 21286250549. The reversal of 21286250496 is 69405268212.

21286250496 is a `hidden beast` number, since 2 + 12 + 8 + 625 + 0 + 4 + 9 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 26707570 + ... + 26708366.

It is an arithmetic number, because the mean of its divisors is an integer number (158162004).

Almost surely, 2^21286250496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21286250496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37958880960).

21286250496 is an abundant number, since it is smaller than the sum of its proper divisors (54631511424).

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

21286250496 is an equidigital number, since it uses as much as digits as its factorization.

21286250496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 832 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 21286250496 in words is "twenty-one billion, two hundred eighty-six million, two hundred fifty thousand, four hundred ninety-six".