21134553 has 32 divisors (see below), whose sum is σ = 32959872. Its totient is φ = 11904000.

The previous prime is 21134527. The next prime is 21134569. The reversal of 21134553 is 35543112.

It is not a de Polignac number, because 21134553 - 2⁵ = 21134521 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21134513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56475 + ... + 56847.

It is an arithmetic number, because the mean of its divisors is an integer number (1029996).

Almost surely, 2^21134553 is an apocalyptic number.

It is an amenable number.

21134553 is a deficient number, since it is larger than the sum of its proper divisors (11825319).

21134553 is a wasteful number, since it uses less digits than its factorization.

21134553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505.

The product of its digits is 1800, while the sum is 24.

The square root of 21134553 is about 4597.2331896479. The cubic root of 21134553 is about 276.4804041367.

Adding to 21134553 its reverse (35543112), we get a palindrome (56677665).

It can be divided in two parts, 2113 and 4553, that added together give a palindrome (6666).

The spelling of 21134553 in words is "twenty-one million, one hundred thirty-four thousand, five hundred fifty-three".