21794430540 has 96 divisors (see below), whose sum is σ = 61464098304. Its totient is φ = 5770114560.

The previous prime is 21794430533. The next prime is 21794430587. The reversal of 21794430540 is 4503449712.

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, 5783737 + ... + 5787503.

It is an arithmetic number, because the mean of its divisors is an integer number (640251024).

Almost surely, 2^21794430540 is an apocalyptic number.

21794430540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21794430540 is an abundant number, since it is smaller than the sum of its proper divisors (39669667764).

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

21794430540 is a wasteful number, since it uses less digits than its factorization.

21794430540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4447 (or 4445 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 21794430540 in words is "twenty-one billion, seven hundred ninety-four million, four hundred thirty thousand, five hundred forty".