21243413332 has 12 divisors (see below), whose sum is σ = 37177842240. Its totient is φ = 10621172696.

The previous prime is 21243413291. The next prime is 21243413339. The reversal of 21243413332 is 23331434212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21243413332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243413339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36082 + ... + 209257.

It is an arithmetic number, because the mean of its divisors is an integer number (3098153520).

Almost surely, 2^21243413332 is an apocalyptic number.

It is an amenable number.

21243413332 is a deficient number, since it is larger than the sum of its proper divisors (15934428908).

21243413332 is a wasteful number, since it uses less digits than its factorization.

21243413332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266990 (or 266988 counting only the distinct ones).

The product of its digits is 10368, while the sum is 28.

Adding to 21243413332 its reverse (23331434212), we get a palindrome (44574847544).

The spelling of 21243413332 in words is "twenty-one billion, two hundred forty-three million, four hundred thirteen thousand, three hundred thirty-two".