21118964897 has 8 divisors (see below), whose sum is σ = 21452261376. Its totient is φ = 20786857632.

The previous prime is 21118964857. The next prime is 21118964921. The reversal of 21118964897 is 79846981112.

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 21118964897 - 2⁸ = 21118964641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21118964807) 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, 261473 + ... + 332574.

It is an arithmetic number, because the mean of its divisors is an integer number (2681532672).

Almost surely, 2^21118964897 is an apocalyptic number.

It is an amenable number.

21118964897 is a deficient number, since it is larger than the sum of its proper divisors (333296479).

21118964897 is an equidigital number, since it uses as much as digits as its factorization.

21118964897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594607.

The product of its digits is 1741824, while the sum is 56.

The spelling of 21118964897 in words is "twenty-one billion, one hundred eighteen million, nine hundred sixty-four thousand, eight hundred ninety-seven".