21443131232 has 12 divisors (see below), whose sum is σ = 42216164676. Its totient is φ = 10721565600.

The previous prime is 21443131223. The next prime is 21443131247. The reversal of 21443131232 is 23213134412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335048894 + ... + 335048957.

It is an arithmetic number, because the mean of its divisors is an integer number (3518013723).

Almost surely, 2^21443131232 is an apocalyptic number.

It is an amenable number.

21443131232 is a deficient number, since it is larger than the sum of its proper divisors (20773033444).

21443131232 is an equidigital number, since it uses as much as digits as its factorization.

21443131232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670097861 (or 670097853 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

Adding to 21443131232 its reverse (23213134412), we get a palindrome (44656265644).

The spelling of 21443131232 in words is "twenty-one billion, four hundred forty-three million, one hundred thirty-one thousand, two hundred thirty-two".