21134451 has 32 divisors (see below), whose sum is σ = 32514048. Its totient is φ = 12096000.

The previous prime is 21134431. The next prime is 21134453. The reversal of 21134451 is 15443112.

It is not a de Polignac number, because 21134451 - 2⁵ = 21134419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21134453) 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, 84076 + ... + 84326.

It is an arithmetic number, because the mean of its divisors is an integer number (1016064).

Almost surely, 2^21134451 is an apocalyptic number.

21134451 is a deficient number, since it is larger than the sum of its proper divisors (11379597).

21134451 is a wasteful number, since it uses less digits than its factorization.

21134451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411.

The product of its digits is 480, while the sum is 21.

The square root of 21134451 is about 4597.2220960054. Note that the first 3 decimals coincide. The cubic root of 21134451 is about 276.4799593509.

Adding to 21134451 its reverse (15443112), we get a palindrome (36577563).

The spelling of 21134451 in words is "twenty-one million, one hundred thirty-four thousand, four hundred fifty-one".