21323466 has 16 divisors (see below), whose sum is σ = 47385600. Its totient is φ = 7107804.

The previous prime is 21323441. The next prime is 21323473. The reversal of 21323466 is 66432312.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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, 197386 + ... + 197493.

It is an arithmetic number, because the mean of its divisors is an integer number (2961600).

Almost surely, 2^21323466 is an apocalyptic number.

21323466 is an abundant number, since it is smaller than the sum of its proper divisors (26062134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21323466 is a wasteful number, since it uses less digits than its factorization.

21323466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394890 (or 394884 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 21323466 is about 4617.7338598061. The cubic root of 21323466 is about 277.3017429783.

Adding to 21323466 its reverse (66432312), we get a palindrome (87755778).

The spelling of 21323466 in words is "twenty-one million, three hundred twenty-three thousand, four hundred sixty-six".