21516596 has 6 divisors (see below), whose sum is σ = 37654050. Its totient is φ = 10758296.

The previous prime is 21516589. The next prime is 21516613. The reversal of 21516596 is 69561512.

It can be written as a sum of positive squares in only one way, i.e., 20124196 + 1392400 = 4486^2 + 1180^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2689571 + ... + 2689578.

It is an arithmetic number, because the mean of its divisors is an integer number (6275675).

Almost surely, 2^21516596 is an apocalyptic number.

It is an amenable number.

21516596 is a deficient number, since it is larger than the sum of its proper divisors (16137454).

21516596 is a wasteful number, since it uses less digits than its factorization.

21516596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5379153 (or 5379151 counting only the distinct ones).

The product of its digits is 16200, while the sum is 35.

The square root of 21516596 is about 4638.5984952354. The cubic root of 21516596 is about 278.1364166672.

The spelling of 21516596 in words is "twenty-one million, five hundred sixteen thousand, five hundred ninety-six".