21753134 has 32 divisors (see below), whose sum is σ = 36723456. Its totient is φ = 9596160.

The previous prime is 21753131. The next prime is 21753163. The reversal of 21753134 is 43135712.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21753131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110324 + ... + 110520.

It is an arithmetic number, because the mean of its divisors is an integer number (1147608).

Almost surely, 2^21753134 is an apocalyptic number.

21753134 is a deficient number, since it is larger than the sum of its proper divisors (14970322).

21753134 is a wasteful number, since it uses less digits than its factorization.

21753134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380.

The product of its digits is 2520, while the sum is 26.

The square root of 21753134 is about 4664.0255145100. The cubic root of 21753134 is about 279.1519151434.

Adding to 21753134 its reverse (43135712), we get a palindrome (64888846).

The spelling of 21753134 in words is "twenty-one million, seven hundred fifty-three thousand, one hundred thirty-four".