21412444552 has 16 divisors (see below), whose sum is σ = 40172883660. Its totient is φ = 10699675584.

The previous prime is 21412444523. The next prime is 21412444579. The reversal of 21412444552 is 25544421412.

It can be written as a sum of positive squares in 2 ways, for example, as 15224104996 + 6188339556 = 123386^2 + 78666^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 804423 + ... + 830614.

Almost surely, 2^21412444552 is an apocalyptic number.

It is an amenable number.

21412444552 is a deficient number, since it is larger than the sum of its proper divisors (18760439108).

21412444552 is a wasteful number, since it uses less digits than its factorization.

21412444552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636680 (or 1636676 counting only the distinct ones).

The product of its digits is 51200, while the sum is 34.

Adding to 21412444552 its reverse (25544421412), we get a palindrome (46956865964).

The spelling of 21412444552 in words is "twenty-one billion, four hundred twelve million, four hundred forty-four thousand, five hundred fifty-two".