21791094 has 32 divisors (see below), whose sum is σ = 47130720. Its totient is φ = 6676992.

The previous prime is 21791087. The next prime is 21791117. The reversal of 21791094 is 49019712.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 25872 + ... + 26700.

It is an arithmetic number, because the mean of its divisors is an integer number (1472835).

Almost surely, 2^21791094 is an apocalyptic number.

21791094 is an abundant number, since it is smaller than the sum of its proper divisors (25339626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21791094 is a wasteful number, since it uses less digits than its factorization.

21791094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 21791094 is about 4668.0931867305. The cubic root of 21791094 is about 279.3141974893.

The spelling of 21791094 in words is "twenty-one million, seven hundred ninety-one thousand, ninety-four".