21374445 has 8 divisors (see below), whose sum is σ = 34199136. Its totient is φ = 11399696.

The previous prime is 21374443. The next prime is 21374453. The reversal of 21374445 is 54447312.

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 21374445 - 2¹ = 21374443 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374443) 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 7 ways as a sum of consecutive naturals, for example, 712467 + ... + 712496.

It is an arithmetic number, because the mean of its divisors is an integer number (4274892).

Almost surely, 2^21374445 is an apocalyptic number.

It is an amenable number.

21374445 is a deficient number, since it is larger than the sum of its proper divisors (12824691).

21374445 is a wasteful number, since it uses less digits than its factorization.

21374445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424971.

The product of its digits is 13440, while the sum is 30.

The square root of 21374445 is about 4623.2504799113. The cubic root of 21374445 is about 277.5225531544.

The spelling of 21374445 in words is "twenty-one million, three hundred seventy-four thousand, four hundred forty-five".