21416144 has 20 divisors (see below), whose sum is σ = 41586624. Its totient is φ = 10684128.

The previous prime is 21416117. The next prime is 21416167. The reversal of 21416144 is 44161412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7529 + ... + 9975.

Almost surely, 2^21416144 is an apocalyptic number.

It is an amenable number.

21416144 is a deficient number, since it is larger than the sum of its proper divisors (20170480).

21416144 is a wasteful number, since it uses less digits than its factorization.

21416144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002 (or 2996 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 21416144 is about 4627.7579884864. The cubic root of 21416144 is about 277.7029070868.

Adding to 21416144 its reverse (44161412), we get a palindrome (65577556).

The spelling of 21416144 in words is "twenty-one million, four hundred sixteen thousand, one hundred forty-four".