21331134 has 32 divisors (see below), whose sum is σ = 51713280. Its totient is φ = 6463800.

The previous prime is 21331133. The next prime is 21331147. The reversal of 21331134 is 43113312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331133) 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, 17362 + ... + 18549.

It is an arithmetic number, because the mean of its divisors is an integer number (1616040).

Almost surely, 2^21331134 is an apocalyptic number.

21331134 is an abundant number, since it is smaller than the sum of its proper divisors (30382146).

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

21331134 is a wasteful number, since it uses less digits than its factorization.

21331134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35933 (or 35927 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 21331134 is about 4618.5640625632. The cubic root of 21331134 is about 277.3349785842.

Adding to 21331134 its reverse (43113312), we get a palindrome (64444446).

The spelling of 21331134 in words is "twenty-one million, three hundred thirty-one thousand, one hundred thirty-four".