21373369 has 8 divisors (see below), whose sum is σ = 22671360. Its totient is φ = 20079936.

The previous prime is 21373361. The next prime is 21373379. The reversal of 21373369 is 96337312.

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

It is a cyclic number.

It is not a de Polignac number, because 21373369 - 2³ = 21373361 is a prime.

It is a super-2 number, since 2×21373369² = 913641804820322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21373361) 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 7 ways as a sum of consecutive naturals, for example, 16072 + ... + 17350.

It is an arithmetic number, because the mean of its divisors is an integer number (2833920).

Almost surely, 2^21373369 is an apocalyptic number.

It is an amenable number.

21373369 is a deficient number, since it is larger than the sum of its proper divisors (1297991).

21373369 is a wasteful number, since it uses less digits than its factorization.

21373369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2279.

The product of its digits is 20412, while the sum is 34.

The square root of 21373369 is about 4623.1341101032. The cubic root of 21373369 is about 277.5178962027.

The spelling of 21373369 in words is "twenty-one million, three hundred seventy-three thousand, three hundred sixty-nine".