21343234 has 8 divisors (see below), whose sum is σ = 34925328. Its totient is φ = 9701460.

The previous prime is 21343187. The next prime is 21343243. The reversal of 21343234 is 43234312.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 970147 = 21343234 / (2 + 1 + 3 + 4 + 3 + 2 + 3 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485052 + ... + 485095.

It is an arithmetic number, because the mean of its divisors is an integer number (4365666).

Almost surely, 2^21343234 is an apocalyptic number.

21343234 is a deficient number, since it is larger than the sum of its proper divisors (13582094).

21343234 is a wasteful number, since it uses less digits than its factorization.

21343234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970160.

The product of its digits is 1728, while the sum is 22.

The square root of 21343234 is about 4619.8738078004. The cubic root of 21343234 is about 277.3874077226.

Adding to 21343234 its reverse (43234312), we get a palindrome (64577546).

The spelling of 21343234 in words is "twenty-one million, three hundred forty-three thousand, two hundred thirty-four".