21461144 has 16 divisors (see below), whose sum is σ = 40725720. Its totient is φ = 10600960.

The previous prime is 21461137. The next prime is 21461173. The reversal of 21461144 is 44116412.

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, 15497 + ... + 16824.

Almost surely, 2^21461144 is an apocalyptic number.

It is an amenable number.

21461144 is a deficient number, since it is larger than the sum of its proper divisors (19264576).

21461144 is a wasteful number, since it uses less digits than its factorization.

21461144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32410 (or 32406 counting only the distinct ones).

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

The square root of 21461144 is about 4632.6174027217. The cubic root of 21461144 is about 277.8972758506.

Adding to 21461144 its reverse (44116412), we get a palindrome (65577556).

The spelling of 21461144 in words is "twenty-one million, four hundred sixty-one thousand, one hundred forty-four".