21074516 has 12 divisors (see below), whose sum is σ = 37386132. Its totient is φ = 10392768.

The previous prime is 21074489. The next prime is 21074519. The reversal of 21074516 is 61547012.

It can be written as a sum of positive squares in 2 ways, for example, as 6482116 + 14592400 = 2546^2 + 3820^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21074519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35795 + ... + 36378.

It is an arithmetic number, because the mean of its divisors is an integer number (3115511).

Almost surely, 2^21074516 is an apocalyptic number.

It is an amenable number.

21074516 is a deficient number, since it is larger than the sum of its proper divisors (16311616).

21074516 is a wasteful number, since it uses less digits than its factorization.

21074516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72250 (or 72248 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21074516 is about 4590.6988574726. The cubic root of 21074516 is about 276.2183562234.

The spelling of 21074516 in words is "twenty-one million, seventy-four thousand, five hundred sixteen".