21460144 has 10 divisors (see below), whose sum is σ = 41579060. Its totient is φ = 10730064.

The previous prime is 21460141. The next prime is 21460147. The reversal of 21460144 is 44106412.

It is an interprime number because it is at equal distance from previous prime (21460141) and next prime (21460147).

It is not an unprimeable number, because it can be changed into a prime (21460141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670614 + ... + 670645.

It is an arithmetic number, because the mean of its divisors is an integer number (4157906).

Almost surely, 2^21460144 is an apocalyptic number.

It is an amenable number.

21460144 is a deficient number, since it is larger than the sum of its proper divisors (20118916).

21460144 is a wasteful number, since it uses less digits than its factorization.

21460144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341267 (or 1341261 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21460144 is about 4632.5094711182. The cubic root of 21460144 is about 277.8929594980.

Adding to 21460144 its reverse (44106412), we get a palindrome (65566556).

The spelling of 21460144 in words is "twenty-one million, four hundred sixty thousand, one hundred forty-four".