21144606 has 32 divisors (see below), whose sum is σ = 50876160. Its totient is φ = 5723136.

The previous prime is 21144593. The next prime is 21144619. The reversal of 21144606 is 60644112.

It is an interprime number because it is at equal distance from previous prime (21144593) and next prime (21144619).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12451 + ... + 14046.

It is an arithmetic number, because the mean of its divisors is an integer number (1589880).

Almost surely, 2^21144606 is an apocalyptic number.

21144606 is an abundant number, since it is smaller than the sum of its proper divisors (29731554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21144606 is a wasteful number, since it uses less digits than its factorization.

21144606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26528.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21144606 is about 4598.3264346934. The cubic root of 21144606 is about 276.5242346816.

Adding to 21144606 its reverse (60644112), we get a palindrome (81788718).

The spelling of 21144606 in words is "twenty-one million, one hundred forty-four thousand, six hundred six".