21207334 has 16 divisors (see below), whose sum is σ = 33314400. Its totient is φ = 10105920.

The previous prime is 21207331. The next prime is 21207341. The reversal of 21207334 is 43370212.

21207334 = 128² + 129² + ... + 403².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21207331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15394 + ... + 16714.

It is an arithmetic number, because the mean of its divisors is an integer number (2082150).

Almost surely, 2^21207334 is an apocalyptic number.

21207334 is a deficient number, since it is larger than the sum of its proper divisors (12107066).

21207334 is a wasteful number, since it uses less digits than its factorization.

21207334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21207334 is about 4605.1421259284. The cubic root of 21207334 is about 276.7974121151.

Adding to 21207334 its reverse (43370212), we get a palindrome (64577546).

The spelling of 21207334 in words is "twenty-one million, two hundred seven thousand, three hundred thirty-four".