21083776 has 32 divisors (see below), whose sum is σ = 48005280. Its totient is φ = 9035520.

The previous prime is 21083773. The next prime is 21083779. The reversal of 21083776 is 67738012.

It is an interprime number because it is at equal distance from previous prime (21083773) and next prime (21083779).

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×21083776² = 889051220836352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21083773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10870 + ... + 12661.

It is an arithmetic number, because the mean of its divisors is an integer number (1500165).

Almost surely, 2^21083776 is an apocalyptic number.

It is an amenable number.

21083776 is an abundant number, since it is smaller than the sum of its proper divisors (26921504).

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

21083776 is an equidigital number, since it uses as much as digits as its factorization.

21083776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23552 (or 23540 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 21083776 is about 4591.7073077451. The cubic root of 21083776 is about 276.2588064595.

The spelling of 21083776 in words is "twenty-one million, eighty-three thousand, seven hundred seventy-six".