21166496 has 96 divisors (see below), whose sum is σ = 49342608. Its totient is φ = 8847360.

The previous prime is 21166489. The next prime is 21166499. The reversal of 21166496 is 69466112.

It can be written as a sum of positive squares in 8 ways, for example, as 4682896 + 16483600 = 2164^2 + 4060^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21166499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289916 + ... + 289988.

Almost surely, 2^21166496 is an apocalyptic number.

21166496 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21166496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24671304).

21166496 is an abundant number, since it is smaller than the sum of its proper divisors (28176112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21166496 is a wasteful number, since it uses less digits than its factorization.

21166496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 146 counting only the distinct ones).

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

The square root of 21166496 is about 4600.7060327737. The cubic root of 21166496 is about 276.6196258791.

The spelling of 21166496 in words is "twenty-one million, one hundred sixty-six thousand, four hundred ninety-six".