21354464 has 24 divisors (see below), whose sum is σ = 42357168. Its totient is φ = 10597120.

The previous prime is 21354451. The next prime is 21354551. The reversal of 21354464 is 46445312.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1949 + ... + 6819.

It is an arithmetic number, because the mean of its divisors is an integer number (1764882).

Almost surely, 2^21354464 is an apocalyptic number.

It is an amenable number.

21354464 is a deficient number, since it is larger than the sum of its proper divisors (21002704).

21354464 is a wasteful number, since it uses less digits than its factorization.

21354464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5018 (or 5010 counting only the distinct ones).

The product of its digits is 11520, while the sum is 29.

The square root of 21354464 is about 4621.0890491312. The cubic root of 21354464 is about 277.4360494358.

Adding to 21354464 its reverse (46445312), we get a palindrome (67799776).

The spelling of 21354464 in words is "twenty-one million, three hundred fifty-four thousand, four hundred sixty-four".