21794797506 has 8 divisors (see below), whose sum is σ = 43589595024. Its totient is φ = 7264932500.

The previous prime is 21794797499. The next prime is 21794797513. The reversal of 21794797506 is 60579749712.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21794797499) and next prime (21794797513).

It is a sphenic number, since it is the product of 3 distinct primes.

21794797506 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1816233120 + ... + 1816233131.

It is an arithmetic number, because the mean of its divisors is an integer number (5448699378).

Almost surely, 2^21794797506 is an apocalyptic number.

21794797506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21794797506 is a wasteful number, since it uses less digits than its factorization.

21794797506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632466256.

The product of its (nonzero) digits is 6667920, while the sum is 57.

The spelling of 21794797506 in words is "twenty-one billion, seven hundred ninety-four million, seven hundred ninety-seven thousand, five hundred six".