21845294 has 16 divisors (see below), whose sum is σ = 34128000. Its totient is φ = 10474464.

The previous prime is 21845293. The next prime is 21845309. The reversal of 21845294 is 49254812.

It is a super-4 number, since 4×21845294⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21845293) 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 7 ways as a sum of consecutive naturals, for example, 7907 + ... + 10305.

It is an arithmetic number, because the mean of its divisors is an integer number (2133000).

Almost surely, 2^21845294 is an apocalyptic number.

21845294 is a deficient number, since it is larger than the sum of its proper divisors (12282706).

21845294 is a wasteful number, since it uses less digits than its factorization.

21845294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587.

The product of its digits is 23040, while the sum is 35.

The square root of 21845294 is about 4673.8949496111. The cubic root of 21845294 is about 279.5455809380.

The spelling of 21845294 in words is "twenty-one million, eight hundred forty-five thousand, two hundred ninety-four".