21194313 has 32 divisors (see below), whose sum is σ = 33792000. Its totient is φ = 11804688.

The previous prime is 21194269. The next prime is 21194323. The reversal of 21194313 is 31349112.

It is not a de Polignac number, because 21194313 - 2¹² = 21190217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21194323) 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, 44008 + ... + 44486.

It is an arithmetic number, because the mean of its divisors is an integer number (1056000).

Almost surely, 2^21194313 is an apocalyptic number.

It is an amenable number.

21194313 is a deficient number, since it is larger than the sum of its proper divisors (12597687).

21194313 is an equidigital number, since it uses as much as digits as its factorization.

21194313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 532 counting only the distinct ones).

The product of its digits is 648, while the sum is 24.

The square root of 21194313 is about 4603.7281631304. The cubic root of 21194313 is about 276.7407506320.

The spelling of 21194313 in words is "twenty-one million, one hundred ninety-four thousand, three hundred thirteen".