21194316 has 144 divisors (see below), whose sum is σ = 66044160. Its totient is φ = 5639040.

The previous prime is 21194269. The next prime is 21194323. The reversal of 21194316 is 61349112.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21194316.

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 47 ways as a sum of consecutive naturals, for example, 118315 + ... + 118493.

It is an arithmetic number, because the mean of its divisors is an integer number (458640).

Almost surely, 2^21194316 is an apocalyptic number.

21194316 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21194316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33022080).

21194316 is an abundant number, since it is smaller than the sum of its proper divisors (44849844).

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

21194316 is a wasteful number, since it uses less digits than its factorization.

21194316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 231 counting only the distinct ones).

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

The square root of 21194316 is about 4603.7284889533. The cubic root of 21194316 is about 276.7407636893.

The spelling of 21194316 in words is "twenty-one million, one hundred ninety-four thousand, three hundred sixteen".