21306134 has 32 divisors (see below), whose sum is σ = 35251200. Its totient is φ = 9618048.

The previous prime is 21306091. The next prime is 21306143. The reversal of 21306134 is 43160312.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 106967 + ... + 107165.

It is an arithmetic number, because the mean of its divisors is an integer number (1101600).

Almost surely, 2^21306134 is an apocalyptic number.

21306134 is a deficient number, since it is larger than the sum of its proper divisors (13945066).

21306134 is a wasteful number, since it uses less digits than its factorization.

21306134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21306134 is about 4615.8568002051. The cubic root of 21306134 is about 277.2265910842.

Adding to 21306134 its reverse (43160312), we get a palindrome (64466446).

The spelling of 21306134 in words is "twenty-one million, three hundred six thousand, one hundred thirty-four".