21344973 has 16 divisors (see below), whose sum is σ = 30750720. Its totient is φ = 13091904.

The previous prime is 21344951. The next prime is 21344987. The reversal of 21344973 is 37944312.

It is not a de Polignac number, because 21344973 - 2⁸ = 21344717 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344903) 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, 14223 + ... + 15651.

It is an arithmetic number, because the mean of its divisors is an integer number (1921920).

Almost surely, 2^21344973 is an apocalyptic number.

It is an amenable number.

21344973 is a deficient number, since it is larger than the sum of its proper divisors (9405747).

21344973 is a wasteful number, since it uses less digits than its factorization.

21344973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828.

The product of its digits is 18144, while the sum is 33.

The square root of 21344973 is about 4620.0620125708. The cubic root of 21344973 is about 277.3949411576.

The spelling of 21344973 in words is "twenty-one million, three hundred forty-four thousand, nine hundred seventy-three".