21096638 has 4 divisors (see below), whose sum is σ = 31644960. Its totient is φ = 10548318.

The previous prime is 21096619. The next prime is 21096653. The reversal of 21096638 is 83669012.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21096598 and 21096607.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5274158 + ... + 5274161.

It is an arithmetic number, because the mean of its divisors is an integer number (7911240).

Almost surely, 2^21096638 is an apocalyptic number.

21096638 is a deficient number, since it is larger than the sum of its proper divisors (10548322).

21096638 is a wasteful number, since it uses less digits than its factorization.

21096638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10548321.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 21096638 is about 4593.1076625744. The cubic root of 21096638 is about 276.3149715802.

The spelling of 21096638 in words is "twenty-one million, ninety-six thousand, six hundred thirty-eight".