21404462 has 16 divisors (see below), whose sum is σ = 34194960. Its totient is φ = 10013568.

The previous prime is 21404459. The next prime is 21404491. The reversal of 21404462 is 26440412.

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 7 ways as a sum of consecutive naturals, for example, 4328 + ... + 7844.

It is an arithmetic number, because the mean of its divisors is an integer number (2137185).

Almost surely, 2^21404462 is an apocalyptic number.

21404462 is a deficient number, since it is larger than the sum of its proper divisors (12790498).

21404462 is a wasteful number, since it uses less digits than its factorization.

21404462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3715.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 21404462 is about 4626.4956500574. The cubic root of 21404462 is about 277.6524044472.

Adding to 21404462 its reverse (26440412), we get a palindrome (47844874).

The spelling of 21404462 in words is "twenty-one million, four hundred four thousand, four hundred sixty-two".