21294273 has 48 divisors (see below), whose sum is σ = 38840256. Its totient is φ = 10200960.

The previous prime is 21294271. The next prime is 21294283. The reversal of 21294273 is 37249212.

It is not a de Polignac number, because 21294273 - 2¹ = 21294271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21294273.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21294271) 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 47 ways as a sum of consecutive naturals, for example, 20515 + ... + 21527.

It is an arithmetic number, because the mean of its divisors is an integer number (809172).

Almost surely, 2^21294273 is an apocalyptic number.

It is an amenable number.

21294273 is a deficient number, since it is larger than the sum of its proper divisors (17545983).

21294273 is a wasteful number, since it uses less digits than its factorization.

21294273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054 (or 1047 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 21294273 is about 4614.5718111218. The cubic root of 21294273 is about 277.1751380620.

The spelling of 21294273 in words is "twenty-one million, two hundred ninety-four thousand, two hundred seventy-three".