21404343 has 8 divisors (see below), whose sum is σ = 30217968. Its totient is φ = 13430144.

The previous prime is 21404321. The next prime is 21404359. The reversal of 21404343 is 34340412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21404343 - 2⁸ = 21404087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209796 + ... + 209897.

It is an arithmetic number, because the mean of its divisors is an integer number (3777246).

Almost surely, 2^21404343 is an apocalyptic number.

21404343 is a deficient number, since it is larger than the sum of its proper divisors (8813625).

21404343 is a wasteful number, since it uses less digits than its factorization.

21404343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419713.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 21404343 is about 4626.4827893336. The cubic root of 21404343 is about 277.6518899019.

Adding to 21404343 its reverse (34340412), we get a palindrome (55744755).

The spelling of 21404343 in words is "twenty-one million, four hundred four thousand, three hundred forty-three".