21323474 has 16 divisors (see below), whose sum is σ = 34960896. Its totient is φ = 9710400.

The previous prime is 21323473. The next prime is 21323479. The reversal of 21323474 is 47432312.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21323473) 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, 9062 + ... + 11169.

It is an arithmetic number, because the mean of its divisors is an integer number (2185056).

Almost surely, 2^21323474 is an apocalyptic number.

21323474 is a deficient number, since it is larger than the sum of its proper divisors (13637422).

21323474 is a wasteful number, since it uses less digits than its factorization.

21323474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20281.

The product of its digits is 4032, while the sum is 26.

The square root of 21323474 is about 4617.7347260318. The cubic root of 21323474 is about 277.3017776571.

Adding to 21323474 its reverse (47432312), we get a palindrome (68755786).

The spelling of 21323474 in words is "twenty-one million, three hundred twenty-three thousand, four hundred seventy-four".