21413144 has 8 divisors (see below), whose sum is σ = 40149660. Its totient is φ = 10706568.

The previous prime is 21413143. The next prime is 21413167. The reversal of 21413144 is 44131412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1338314 + ... + 1338329.

Almost surely, 2^21413144 is an apocalyptic number.

It is an amenable number.

21413144 is a deficient number, since it is larger than the sum of its proper divisors (18736516).

21413144 is a wasteful number, since it uses less digits than its factorization.

21413144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676649 (or 2676645 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 21413144 is about 4627.4338460966. The cubic root of 21413144 is about 277.6899394921.

Adding to 21413144 its reverse (44131412), we get a palindrome (65544556).

The spelling of 21413144 in words is "twenty-one million, four hundred thirteen thousand, one hundred forty-four".