21135326 has 8 divisors (see below), whose sum is σ = 31842120. Its totient is φ = 10521288.

The previous prime is 21135311. The next prime is 21135329. The reversal of 21135326 is 62353112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22616 + ... + 23531.

It is an arithmetic number, because the mean of its divisors is an integer number (3980265).

Almost surely, 2^21135326 is an apocalyptic number.

21135326 is a deficient number, since it is larger than the sum of its proper divisors (10706794).

21135326 is a wasteful number, since it uses less digits than its factorization.

21135326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46378.

The product of its digits is 1080, while the sum is 23.

The square root of 21135326 is about 4597.3172611861. The cubic root of 21135326 is about 276.4837748688.

Adding to 21135326 its reverse (62353112), we get a palindrome (83488438).

The spelling of 21135326 in words is "twenty-one million, one hundred thirty-five thousand, three hundred twenty-six".