21795618280 has 64 divisors (see below), whose sum is σ = 49408704000. Its totient is φ = 8652948480.

The previous prime is 21795618253. The next prime is 21795618287. The reversal of 21795618280 is 8281659712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21795618287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3427584 + ... + 3433936.

It is an arithmetic number, because the mean of its divisors is an integer number (772011000).

Almost surely, 2^21795618280 is an apocalyptic number.

21795618280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21795618280 is an abundant number, since it is smaller than the sum of its proper divisors (27613085720).

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

21795618280 is a wasteful number, since it uses less digits than its factorization.

21795618280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6994 (or 6990 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 21795618280 in words is "twenty-one billion, seven hundred ninety-five million, six hundred eighteen thousand, two hundred eighty".