21405314 has 48 divisors (see below), whose sum is σ = 39847104. Its totient is φ = 8436960.

The previous prime is 21405313. The next prime is 21405337. The reversal of 21405314 is 41350412.

21405314 is nontrivially palindromic in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21405313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 497777 + ... + 497819.

It is an arithmetic number, because the mean of its divisors is an integer number (830148).

Almost surely, 2^21405314 is an apocalyptic number.

21405314 is a deficient number, since it is larger than the sum of its proper divisors (18441790).

21405314 is a wasteful number, since it uses less digits than its factorization.

21405314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21405314 is about 4626.5877274726. The cubic root of 21405314 is about 277.6560883630.

Adding to 21405314 its reverse (41350412), we get a palindrome (62755726).

The spelling of 21405314 in words is "twenty-one million, four hundred five thousand, three hundred fourteen".