21794959620 has 288 divisors, whose sum is σ = 80139870720. Its totient is φ = 4686612480.

The previous prime is 21794959619. The next prime is 21794959639. The reversal of 21794959620 is 2695949712.

21794959620 is a `hidden beast` number, since 2 + 1 + 7 + 9 + 4 + 9 + 5 + 9 + 620 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1761616 + ... + 1773944.

It is an arithmetic number, because the mean of its divisors is an integer number (278263440).

Almost surely, 2^21794959620 is an apocalyptic number.

21794959620 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 21794959620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40069935360).

21794959620 is an abundant number, since it is smaller than the sum of its proper divisors (58344911100).

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

21794959620 is a wasteful number, since it uses less digits than its factorization.

21794959620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12435 (or 12430 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 21794959620 in words is "twenty-one billion, seven hundred ninety-four million, nine hundred fifty-nine thousand, six hundred twenty".