21444134 has 4 divisors (see below), whose sum is σ = 32166204. Its totient is φ = 10722066.

The previous prime is 21444131. The next prime is 21444139. The reversal of 21444134 is 43144412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5361032 + ... + 5361035.

It is an arithmetic number, because the mean of its divisors is an integer number (8041551).

Almost surely, 2^21444134 is an apocalyptic number.

21444134 is a deficient number, since it is larger than the sum of its proper divisors (10722070).

21444134 is a wasteful number, since it uses less digits than its factorization.

21444134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10722069.

The product of its digits is 1536, while the sum is 23.

The square root of 21444134 is about 4630.7811436085. The cubic root of 21444134 is about 277.8238364277.

Adding to 21444134 its reverse (43144412), we get a palindrome (64588546).

The spelling of 21444134 in words is "twenty-one million, four hundred forty-four thousand, one hundred thirty-four".