21423303232 has 14 divisors (see below), whose sum is σ = 42511867478. Its totient is φ = 10711651584.

The previous prime is 21423303217. The next prime is 21423303271. The reversal of 21423303232 is 23230332412.

It can be written as a sum of positive squares in only one way, i.e., 15902218816 + 5521084416 = 126104^2 + 74304^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21423303197 and 21423303206.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167369493 + ... + 167369620.

Almost surely, 2^21423303232 is an apocalyptic number.

It is an amenable number.

21423303232 is a deficient number, since it is larger than the sum of its proper divisors (21088564246).

21423303232 is an equidigital number, since it uses as much as digits as its factorization.

21423303232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334739125 (or 334739115 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 21423303232 its reverse (23230332412), we get a palindrome (44653635644).

The spelling of 21423303232 in words is "twenty-one billion, four hundred twenty-three million, three hundred three thousand, two hundred thirty-two".