21443251352 has 16 divisors (see below), whose sum is σ = 41141122440. Its totient is φ = 10472285376.

The previous prime is 21443251351. The next prime is 21443251367. The reversal of 21443251352 is 25315234412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443251351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31167173 + ... + 31167860.

Almost surely, 2^21443251352 is an apocalyptic number.

It is an amenable number.

21443251352 is a deficient number, since it is larger than the sum of its proper divisors (19697871088).

21443251352 is a wasteful number, since it uses less digits than its factorization.

21443251352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62335082 (or 62335078 counting only the distinct ones).

The product of its digits is 28800, while the sum is 32.

Adding to 21443251352 its reverse (25315234412), we get a palindrome (46758485764).

The spelling of 21443251352 in words is "twenty-one billion, four hundred forty-three million, two hundred fifty-one thousand, three hundred fifty-two".