21761896 has 16 divisors (see below), whose sum is σ = 43942500. Its totient is φ = 10043904.

The previous prime is 21761891. The next prime is 21761899. The reversal of 21761896 is 69816712.

It can be written as a sum of positive squares in 2 ways, for example, as 21252100 + 509796 = 4610^2 + 714^2 .

It is not an unprimeable number, because it can be changed into a prime (21761891) 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 3 ways as a sum of consecutive naturals, for example, 104521 + ... + 104728.

Almost surely, 2^21761896 is an apocalyptic number.

21761896 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21761896 is an abundant number, since it is smaller than the sum of its proper divisors (22180604).

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

21761896 is a wasteful number, since it uses less digits than its factorization.

21761896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209268 (or 209264 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 21761896 is about 4664.9647372729. The cubic root of 21761896 is about 279.1893902149.

The spelling of 21761896 in words is "twenty-one million, seven hundred sixty-one thousand, eight hundred ninety-six".