21294873 has 16 divisors (see below), whose sum is σ = 31646400. Its totient is φ = 14152320.

The previous prime is 21294859. The next prime is 21294881. The reversal of 21294873 is 37849212.

It is not a de Polignac number, because 21294873 - 2⁴ = 21294857 is a prime.

It is a super-2 number, since 2×21294873² = 906943232172258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21294853) 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, 9193 + ... + 11273.

It is an arithmetic number, because the mean of its divisors is an integer number (1977900).

Almost surely, 2^21294873 is an apocalyptic number.

It is an amenable number.

21294873 is a deficient number, since it is larger than the sum of its proper divisors (10351527).

21294873 is a wasteful number, since it uses less digits than its factorization.

21294873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469 (or 2463 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 21294873 is about 4614.6368221129. The cubic root of 21294873 is about 277.1777413210.

The spelling of 21294873 in words is "twenty-one million, two hundred ninety-four thousand, eight hundred seventy-three".