21083091 has 8 divisors (see below), whose sum is σ = 28530624. Its totient is φ = 13845480.

The previous prime is 21083063. The next prime is 21083093. The reversal of 21083091 is 19038012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21083091 - 2¹¹ = 21081043 is a prime.

It is a super-2 number, since 2×21083091² = 888993452228562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21083093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52245 + ... + 52646.

It is an arithmetic number, because the mean of its divisors is an integer number (3566328).

Almost surely, 2^21083091 is an apocalyptic number.

21083091 is a deficient number, since it is larger than the sum of its proper divisors (7447533).

21083091 is a wasteful number, since it uses less digits than its factorization.

21083091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104961.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21083091 is about 4591.6327161479. The cubic root of 21083091 is about 276.2558145961.

The spelling of 21083091 in words is "twenty-one million, eighty-three thousand, ninety-one".