21074573 has 8 divisors (see below), whose sum is σ = 22863288. Its totient is φ = 19309824.

The previous prime is 21074569. The next prime is 21074587. The reversal of 21074573 is 37547012.

It can be written as a sum of positive squares in 4 ways, for example, as 5098564 + 15976009 = 2258^2 + 3997^2 .

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 21074573 - 2² = 21074569 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21974573) 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, 4136 + ... + 7697.

It is an arithmetic number, because the mean of its divisors is an integer number (2857911).

Almost surely, 2^21074573 is an apocalyptic number.

It is an amenable number.

21074573 is a deficient number, since it is larger than the sum of its proper divisors (1788715).

21074573 is a wasteful number, since it uses less digits than its factorization.

21074573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11983.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 21074573 is about 4590.7050656735. The cubic root of 21074573 is about 276.2186052513.

The spelling of 21074573 in words is "twenty-one million, seventy-four thousand, five hundred seventy-three".