21421143232 has 14 divisors (see below), whose sum is σ = 42507581228. Its totient is φ = 10710571584.

The previous prime is 21421143223. The next prime is 21421143281. The reversal of 21421143232 is 23234112412.

It is a junction number, because it is equal to n+sod(n) for n = 21421143197 and 21421143206.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 167352618 + ... + 167352745.

It is an arithmetic number, because the mean of its divisors is an integer number (3036255802).

Almost surely, 2^21421143232 is an apocalyptic number.

It is an amenable number.

21421143232 is a deficient number, since it is larger than the sum of its proper divisors (21086437996).

21421143232 is an equidigital number, since it uses as much as digits as its factorization.

21421143232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334705375 (or 334705365 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

Adding to 21421143232 its reverse (23234112412), we get a palindrome (44655255644).

The spelling of 21421143232 in words is "twenty-one billion, four hundred twenty-one million, one hundred forty-three thousand, two hundred thirty-two".