21403230052 has 12 divisors (see below), whose sum is σ = 37457354620. Its totient is φ = 10701128736.

The previous prime is 21403230019. The next prime is 21403230097. The reversal of 21403230052 is 25003230412.

It can be written as a sum of positive squares in 2 ways, for example, as 13081411876 + 8321818176 = 114374^2 + 91224^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11463 + ... + 207214.

Almost surely, 2^21403230052 is an apocalyptic number.

It is an amenable number.

21403230052 is a deficient number, since it is larger than the sum of its proper divisors (16054124568).

21403230052 is a wasteful number, since it uses less digits than its factorization.

21403230052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243150 (or 243148 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

Adding to 21403230052 its reverse (25003230412), we get a palindrome (46406460464).

The spelling of 21403230052 in words is "twenty-one billion, four hundred three million, two hundred thirty thousand, fifty-two".