21794156160 has 256 divisors, whose sum is σ = 79926220800. Its totient is φ = 4948070400.

The previous prime is 21794156149. The next prime is 21794156233. The reversal of 21794156160 is 6165149712.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2024071 + ... + 2034809.

It is an arithmetic number, because the mean of its divisors is an integer number (312211800).

Almost surely, 2^21794156160 is an apocalyptic number.

21794156160 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 21794156160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39963110400).

21794156160 is an abundant number, since it is smaller than the sum of its proper divisors (58132064640).

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

21794156160 is a wasteful number, since it uses less digits than its factorization.

21794156160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10919 (or 10907 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 21794156160 in words is "twenty-one billion, seven hundred ninety-four million, one hundred fifty-six thousand, one hundred sixty".