21280234 has 8 divisors (see below), whose sum is σ = 31970628. Its totient is φ = 10623360.

The previous prime is 21280223. The next prime is 21280241. The reversal of 21280234 is 43208212.

It can be written as a sum of positive squares in 2 ways, for example, as 20475625 + 804609 = 4525^2 + 897^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 6727 + ... + 9370.

Almost surely, 2^21280234 is an apocalyptic number.

21280234 is a deficient number, since it is larger than the sum of its proper divisors (10690394).

21280234 is a wasteful number, since it uses less digits than its factorization.

21280234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16760.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21280234 is about 4613.0504007652. The cubic root of 21280234 is about 277.1142121779.

Adding to 21280234 its reverse (43208212), we get a palindrome (64488446).

The spelling of 21280234 in words is "twenty-one million, two hundred eighty thousand, two hundred thirty-four".