21094139 has 8 divisors (see below), whose sum is σ = 23045040. Its totient is φ = 19148800.

The previous prime is 21094133. The next prime is 21094163. The reversal of 21094139 is 93149012.

It is a happy number.

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

It is not a de Polignac number, because 21094139 - 2²⁰ = 20045563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21094133) 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, 14267 + ... + 15675.

It is an arithmetic number, because the mean of its divisors is an integer number (2880630).

Almost surely, 2^21094139 is an apocalyptic number.

21094139 is a deficient number, since it is larger than the sum of its proper divisors (1950901).

21094139 is a wasteful number, since it uses less digits than its factorization.

21094139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2781.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 21094139 is about 4592.8356164792. The cubic root of 21094139 is about 276.3040608626.

It can be divided in two parts, 210 and 94139, that added together give a palindrome (94349).

The spelling of 21094139 in words is "twenty-one million, ninety-four thousand, one hundred thirty-nine".