21542798596 has 24 divisors (see below), whose sum is σ = 42545341440. Its totient is φ = 9454519200.

The previous prime is 21542798593. The next prime is 21542798611. The reversal of 21542798596 is 69589724512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a self number, because there is not a number n which added to its sum of digits gives 21542798596.

It is not an unprimeable number, because it can be changed into a prime (21542798593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8440260 + ... + 8442811.

It is an arithmetic number, because the mean of its divisors is an integer number (1772722560).

Almost surely, 2^21542798596 is an apocalyptic number.

It is an amenable number.

21542798596 is a deficient number, since it is larger than the sum of its proper divisors (21002542844).

21542798596 is a wasteful number, since it uses less digits than its factorization.

21542798596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16883115 (or 16883113 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 58.

The spelling of 21542798596 in words is "twenty-one billion, five hundred forty-two million, seven hundred ninety-eight thousand, five hundred ninety-six".