21096566 has 8 divisors (see below), whose sum is σ = 33020784. Its totient is φ = 10089640.

The previous prime is 21096557. The next prime is 21096583. The reversal of 21096566 is 66569012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229265 + ... + 229356.

It is an arithmetic number, because the mean of its divisors is an integer number (4127598).

Almost surely, 2^21096566 is an apocalyptic number.

21096566 is a deficient number, since it is larger than the sum of its proper divisors (11924218).

21096566 is a wasteful number, since it uses less digits than its factorization.

21096566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458646.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 21096566 is about 4593.0998247371. The cubic root of 21096566 is about 276.3146572378.

The spelling of 21096566 in words is "twenty-one million, ninety-six thousand, five hundred sixty-six".