21534887795 has 8 divisors (see below), whose sum is σ = 25851987024. Its totient is φ = 17221162464.

The previous prime is 21534887791. The next prime is 21534887813. The reversal of 21534887795 is 59778843512.

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

It is a cyclic number.

It is not a de Polignac number, because 21534887795 - 2² = 21534887791 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21534887791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 829409 + ... + 854978.

It is an arithmetic number, because the mean of its divisors is an integer number (3231498378).

Almost surely, 2^21534887795 is an apocalyptic number.

21534887795 is a deficient number, since it is larger than the sum of its proper divisors (4317099229).

21534887795 is a wasteful number, since it uses less digits than its factorization.

21534887795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686949.

The product of its digits is 16934400, while the sum is 59.

The spelling of 21534887795 in words is "twenty-one billion, five hundred thirty-four million, eight hundred eighty-seven thousand, seven hundred ninety-five".