21832091 has 8 divisors (see below), whose sum is σ = 22656000. Its totient is φ = 21015720.

The previous prime is 21832087. The next prime is 21832103. The reversal of 21832091 is 19023812.

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 21832091 - 2² = 21832087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21832091.

It is not an unprimeable number, because it can be changed into a prime (21832051) 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, 4400 + ... + 7938.

It is an arithmetic number, because the mean of its divisors is an integer number (2832000).

Almost surely, 2^21832091 is an apocalyptic number.

21832091 is a deficient number, since it is larger than the sum of its proper divisors (823909).

21832091 is a wasteful number, since it uses less digits than its factorization.

21832091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3769.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21832091 is about 4672.4823167135. The cubic root of 21832091 is about 279.4892517332.

The spelling of 21832091 in words is "twenty-one million, eight hundred thirty-two thousand, ninety-one".