21611311889 has 8 divisors (see below), whose sum is σ = 21710160000. Its totient is φ = 21512503152.

The previous prime is 21611311817. The next prime is 21611311901. The reversal of 21611311889 is 98811311612.

It is a happy number.

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 21611311889 - 2⁸ = 21611311633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21614311889) 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, 2101442 + ... + 2111700.

It is an arithmetic number, because the mean of its divisors is an integer number (2713770000).

Almost surely, 2^21611311889 is an apocalyptic number.

It is an amenable number.

21611311889 is a deficient number, since it is larger than the sum of its proper divisors (98848111).

21611311889 is a wasteful number, since it uses less digits than its factorization.

21611311889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19687.

The product of its digits is 20736, while the sum is 41.

The spelling of 21611311889 in words is "twenty-one billion, six hundred eleven million, three hundred eleven thousand, eight hundred eighty-nine".