21144106 has 4 divisors (see below), whose sum is σ = 31716162. Its totient is φ = 10572052.

The previous prime is 21144083. The next prime is 21144119. The reversal of 21144106 is 60144112.

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

It can be written as a sum of positive squares in only one way, i.e., 19280881 + 1863225 = 4391^2 + 1365^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5286025 + ... + 5286028.

Almost surely, 2^21144106 is an apocalyptic number.

21144106 is a deficient number, since it is larger than the sum of its proper divisors (10572056).

21144106 is a wasteful number, since it uses less digits than its factorization.

21144106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10572055.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21144106 is about 4598.2720667659. The cubic root of 21144106 is about 276.5220550365.

Adding to 21144106 its reverse (60144112), we get a palindrome (81288218).

The spelling of 21144106 in words is "twenty-one million, one hundred forty-four thousand, one hundred six".