21235134 has 16 divisors (see below), whose sum is σ = 43935120. Its totient is φ = 6834240.

The previous prime is 21235127. The next prime is 21235147. The reversal of 21235134 is 43153212.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21235134.

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 7 ways as a sum of consecutive naturals, for example, 60847 + ... + 61194.

It is an arithmetic number, because the mean of its divisors is an integer number (2745945).

Almost surely, 2^21235134 is an apocalyptic number.

21235134 is an abundant number, since it is smaller than the sum of its proper divisors (22699986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21235134 is a wasteful number, since it uses less digits than its factorization.

21235134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122075.

The product of its digits is 720, while the sum is 21.

The square root of 21235134 is about 4608.1595024478. The cubic root of 21235134 is about 276.9183075271.

Adding to 21235134 its reverse (43153212), we get a palindrome (64388346).

The spelling of 21235134 in words is "twenty-one million, two hundred thirty-five thousand, one hundred thirty-four".