21374573 has 8 divisors (see below), whose sum is σ = 23532960. Its totient is φ = 19252080.

The previous prime is 21374543. The next prime is 21374597. The reversal of 21374573 is 37547312.

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 21374573 - 2¹⁰ = 21373549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7715 + ... + 10112.

It is an arithmetic number, because the mean of its divisors is an integer number (2941620).

Almost surely, 2^21374573 is an apocalyptic number.

It is an amenable number.

21374573 is a deficient number, since it is larger than the sum of its proper divisors (2158387).

21374573 is a wasteful number, since it uses less digits than its factorization.

21374573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17947.

The product of its digits is 17640, while the sum is 32.

The square root of 21374573 is about 4623.2643229649. The cubic root of 21374573 is about 277.5231071308.

The spelling of 21374573 in words is "twenty-one million, three hundred seventy-four thousand, five hundred seventy-three".