21794292 has 144 divisors (see below), whose sum is σ = 65714880. Its totient is φ = 6205248.

The previous prime is 21794287. The next prime is 21794299. The reversal of 21794292 is 29249712.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21794299) 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 47 ways as a sum of consecutive naturals, for example, 506823 + ... + 506865.

Almost surely, 2^21794292 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21794292, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32857440).

21794292 is an abundant number, since it is smaller than the sum of its proper divisors (43920588).

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

21794292 is a wasteful number, since it uses less digits than its factorization.

21794292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 80 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 21794292 is about 4668.4357123131. The cubic root of 21794292 is about 279.3278606110.

The spelling of 21794292 in words is "twenty-one million, seven hundred ninety-four thousand, two hundred ninety-two".