21235443532 has 24 divisors (see below), whose sum is σ = 38128321616. Its totient is φ = 10342963008.

The previous prime is 21235443451. The next prime is 21235443539. The reversal of 21235443532 is 23534453212.

It is not an unprimeable number, because it can be changed into a prime (21235443539) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 101343 + ... + 229654.

Almost surely, 2^21235443532 is an apocalyptic number.

It is an amenable number.

21235443532 is a deficient number, since it is larger than the sum of its proper divisors (16892878084).

21235443532 is a wasteful number, since it uses less digits than its factorization.

21235443532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331417 (or 331415 counting only the distinct ones).

The product of its digits is 86400, while the sum is 34.

Adding to 21235443532 its reverse (23534453212), we get a palindrome (44769896744).

The spelling of 21235443532 in words is "twenty-one billion, two hundred thirty-five million, four hundred forty-three thousand, five hundred thirty-two".