21420224032 has 24 divisors (see below), whose sum is σ = 42271261452. Its totient is φ = 10684665600.

The previous prime is 21420224029. The next prime is 21420224051. The reversal of 21420224032 is 23042202412.

It can be written as a sum of positive squares in 2 ways, for example, as 21410712976 + 9511056 = 146324^2 + 3084^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21420223994 and 21420224012.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 781519 + ... + 808462.

Almost surely, 2^21420224032 is an apocalyptic number.

It is an amenable number.

21420224032 is a deficient number, since it is larger than the sum of its proper divisors (20851037420).

21420224032 is a wasteful number, since it uses less digits than its factorization.

21420224032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590412 (or 1590404 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21420224032 its reverse (23042202412), we get a palindrome (44462426444).

The spelling of 21420224032 in words is "twenty-one billion, four hundred twenty million, two hundred twenty-four thousand, thirty-two".