21894313889 has 32 divisors (see below), whose sum is σ = 27464209920. Its totient is φ = 17018330112.

The previous prime is 21894313843. The next prime is 21894313901. The reversal of 21894313889 is 98831349812.

It is not a de Polignac number, because 21894313889 - 2¹² = 21894309793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21894313789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1729547 + ... + 1742159.

It is an arithmetic number, because the mean of its divisors is an integer number (858256560).

Almost surely, 2^21894313889 is an apocalyptic number.

21894313889 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21894313889 is a deficient number, since it is larger than the sum of its proper divisors (5569896031).

21894313889 is a wasteful number, since it uses less digits than its factorization.

21894313889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13169.

The product of its digits is 2985984, while the sum is 56.

The spelling of 21894313889 in words is "twenty-one billion, eight hundred ninety-four million, three hundred thirteen thousand, eight hundred eighty-nine".