21126294 has 48 divisors (see below), whose sum is σ = 52835328. Its totient is φ = 5975856.

The previous prime is 21126293. The next prime is 21126317. The reversal of 21126294 is 49262112.

21126294 is a `hidden beast` number, since 21 + 12 + 629 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126293) 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 23 ways as a sum of consecutive naturals, for example, 12699 + ... + 14265.

It is an arithmetic number, because the mean of its divisors is an integer number (1100736).

Almost surely, 2^21126294 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21126294, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26417664).

21126294 is an abundant number, since it is smaller than the sum of its proper divisors (31709034).

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

21126294 is a wasteful number, since it uses less digits than its factorization.

21126294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689 (or 1686 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 21126294 is about 4596.3348441992. The cubic root of 21126294 is about 276.4443849353. Note that the first 3 decimals are identical.

The spelling of 21126294 in words is "twenty-one million, one hundred twenty-six thousand, two hundred ninety-four".