21243330553532 has 6 divisors (see below), whose sum is σ = 37175828468688. Its totient is φ = 10621665276764.

The previous prime is 21243330553507. The next prime is 21243330553561. The reversal of 21243330553532 is 23535503334212.

It is a self number, because there is not a number n which added to its sum of digits gives 21243330553532.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2655416319188 + ... + 2655416319195.

It is an arithmetic number, because the mean of its divisors is an integer number (6195971411448).

Almost surely, 2^{21243330553532} is an apocalyptic number.

It is an amenable number.

21243330553532 is a deficient number, since it is larger than the sum of its proper divisors (15932497915156).

21243330553532 is a wasteful number, since it uses less digits than its factorization.

21243330553532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5310832638387 (or 5310832638385 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 41.

Adding to 21243330553532 its reverse (23535503334212), we get a palindrome (44778833887744).

The spelling of 21243330553532 in words is "twenty-one trillion, two hundred forty-three billion, three hundred thirty million, five hundred fifty-three thousand, five hundred thirty-two".