21833091 has 32 divisors (see below), whose sum is σ = 37184000. Its totient is φ = 12402720.

The previous prime is 21833081. The next prime is 21833107. The reversal of 21833091 is 19033812.

It is not a de Polignac number, because 21833091 - 2⁷ = 21832963 is a prime.

It is a super-2 number, since 2×21833091² = 953367725228562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21833041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62385 + ... + 62733.

It is an arithmetic number, because the mean of its divisors is an integer number (1162000).

Almost surely, 2^21833091 is an apocalyptic number.

21833091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21833091 is a deficient number, since it is larger than the sum of its proper divisors (15350909).

21833091 is a wasteful number, since it uses less digits than its factorization.

21833091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21833091 is about 4672.5893249889. The cubic root of 21833091 is about 279.4935189223.

The spelling of 21833091 in words is "twenty-one million, eight hundred thirty-three thousand, ninety-one".