21096623 has 8 divisors (see below), whose sum is σ = 21869760. Its totient is φ = 20334240.

The previous prime is 21096619. The next prime is 21096653. The reversal of 21096623 is 32669012.

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 21096623 - 2² = 21096619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21096653) 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, 1418 + ... + 6648.

It is an arithmetic number, because the mean of its divisors is an integer number (2733720).

Almost surely, 2^21096623 is an apocalyptic number.

21096623 is a deficient number, since it is larger than the sum of its proper divisors (773137).

21096623 is a wasteful number, since it uses less digits than its factorization.

21096623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5377.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 21096623 is about 4593.1060296928. The cubic root of 21096623 is about 276.3149060923.

The spelling of 21096623 in words is "twenty-one million, ninety-six thousand, six hundred twenty-three".