21689883 has 16 divisors (see below), whose sum is σ = 33242400. Its totient is φ = 13960800.

The previous prime is 21689867. The next prime is 21689893. The reversal of 21689883 is 38898612.

It is not a de Polignac number, because 21689883 - 2⁴ = 21689867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21689803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13068 + ... + 14633.

It is an arithmetic number, because the mean of its divisors is an integer number (2077650).

Almost surely, 2^21689883 is an apocalyptic number.

21689883 is a deficient number, since it is larger than the sum of its proper divisors (11552517).

21689883 is a wasteful number, since it uses less digits than its factorization.

21689883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27739 (or 27733 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 21689883 is about 4657.2398478069. The cubic root of 21689883 is about 278.8810916577.

The spelling of 21689883 in words is "twenty-one million, six hundred eighty-nine thousand, eight hundred eighty-three".