21096637 has 8 divisors (see below), whose sum is σ = 21336120. Its totient is φ = 20858880.

The previous prime is 21096619. The next prime is 21096653. The reversal of 21096637 is 73669012.

It can be written as a sum of positive squares in 4 ways, for example, as 900601 + 20196036 = 949^2 + 4494^2 .

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 21096637 - 2¹¹ = 21094589 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 (21096437) 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, 54039 + ... + 54427.

It is an arithmetic number, because the mean of its divisors is an integer number (2667015).

Almost surely, 2^21096637 is an apocalyptic number.

It is an amenable number.

21096637 is a deficient number, since it is larger than the sum of its proper divisors (239483).

21096637 is a wasteful number, since it uses less digits than its factorization.

21096637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 21096637 is about 4593.1075537157. The cubic root of 21096637 is about 276.3149672143.

The spelling of 21096637 in words is "twenty-one million, ninety-six thousand, six hundred thirty-seven".