21899418889 has 4 divisors (see below), whose sum is σ = 21943306000. Its totient is φ = 21855531780.

The previous prime is 21899418883. The next prime is 21899418907. The reversal of 21899418889 is 98881499812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21899418889 - 2¹⁵ = 21899386121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21899418883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21942807 + ... + 21943804.

It is an arithmetic number, because the mean of its divisors is an integer number (5485826500).

Almost surely, 2^21899418889 is an apocalyptic number.

It is an amenable number.

21899418889 is a deficient number, since it is larger than the sum of its proper divisors (43887111).

21899418889 is an equidigital number, since it uses as much as digits as its factorization.

21899418889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43887110.

The product of its digits is 23887872, while the sum is 67.

The spelling of 21899418889 in words is "twenty-one billion, eight hundred ninety-nine million, four hundred eighteen thousand, eight hundred eighty-nine".