21283104 has 96 divisors (see below), whose sum is σ = 58786560. Its totient is φ = 6735872.

The previous prime is 21283091. The next prime is 21283111. The reversal of 21283104 is 40138212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239092 + ... + 239180.

It is an arithmetic number, because the mean of its divisors is an integer number (612360).

Almost surely, 2^21283104 is an apocalyptic number.

21283104 is a gapful number since it is divisible by the number (24) 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 21283104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29393280).

21283104 is an abundant number, since it is smaller than the sum of its proper divisors (37503456).

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

21283104 is a wasteful number, since it uses less digits than its factorization.

21283104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21283104 is about 4613.3614642688. The cubic root of 21283104 is about 277.1266694663.

The spelling of 21283104 in words is "twenty-one million, two hundred eighty-three thousand, one hundred four".