21243334 has 16 divisors (see below), whose sum is σ = 36481536. Its totient is φ = 9088200.

The previous prime is 21243331. The next prime is 21243347. The reversal of 21243334 is 43334212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243331) 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, 10419 + ... + 12289.

It is an arithmetic number, because the mean of its divisors is an integer number (2280096).

Almost surely, 2^21243334 is an apocalyptic number.

21243334 is a deficient number, since it is larger than the sum of its proper divisors (15238202).

21243334 is a wasteful number, since it uses less digits than its factorization.

21243334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2691.

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

The square root of 21243334 is about 4609.0491427191. The cubic root of 21243334 is about 276.9539471719.

Adding to 21243334 its reverse (43334212), we get a palindrome (64577546).

The spelling of 21243334 in words is "twenty-one million, two hundred forty-three thousand, three hundred thirty-four".