21096782 has 16 divisors (see below), whose sum is σ = 36229632. Its totient is φ = 9025560.

The previous prime is 21096763. The next prime is 21096787. The reversal of 21096782 is 28769012.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21096787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10607 + ... + 12437.

It is an arithmetic number, because the mean of its divisors is an integer number (2264352).

Almost surely, 2^21096782 is an apocalyptic number.

21096782 is a deficient number, since it is larger than the sum of its proper divisors (15132850).

21096782 is a wasteful number, since it uses less digits than its factorization.

21096782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 21096782 is about 4593.1233382090. The cubic root of 21096782 is about 276.3156002627.

The spelling of 21096782 in words is "twenty-one million, ninety-six thousand, seven hundred eighty-two".