21284094 has 32 divisors (see below), whose sum is σ = 46214784. Its totient is φ = 6495840.

The previous prime is 21284093. The next prime is 21284117. The reversal of 21284094 is 49048212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21284093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9177 + ... + 11259.

It is an arithmetic number, because the mean of its divisors is an integer number (1444212).

Almost surely, 2^21284094 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21284094, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23107392).

21284094 is an abundant number, since it is smaller than the sum of its proper divisors (24930690).

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

21284094 is a wasteful number, since it uses less digits than its factorization.

21284094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21284094 is about 4613.4687600546. The cubic root of 21284094 is about 277.1309663200.

The spelling of 21284094 in words is "twenty-one million, two hundred eighty-four thousand, ninety-four".