21234389 has 8 divisors (see below), whose sum is σ = 23704032. Its totient is φ = 18854640.

The previous prime is 21234379. The next prime is 21234391. The reversal of 21234389 is 98343212.

It is a happy number.

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

It is not a de Polignac number, because 21234389 - 2⁴ = 21234373 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234379) 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, 21974 + ... + 22919.

It is an arithmetic number, because the mean of its divisors is an integer number (2963004).

Almost surely, 2^21234389 is an apocalyptic number.

It is an amenable number.

21234389 is a deficient number, since it is larger than the sum of its proper divisors (2469643).

21234389 is a wasteful number, since it uses less digits than its factorization.

21234389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44947.

The product of its digits is 10368, while the sum is 32.

The square root of 21234389 is about 4608.0786668632. The cubic root of 21234389 is about 276.9150690803.

The spelling of 21234389 in words is "twenty-one million, two hundred thirty-four thousand, three hundred eighty-nine".