21230021332 has 18 divisors (see below), whose sum is σ = 40230263598. Its totient is φ = 9798471072.

The previous prime is 21230021297. The next prime is 21230021347. The reversal of 21230021332 is 23312003212.

It can be written as a sum of positive squares in 3 ways, for example, as 26584336 + 21203436996 = 5156^2 + 145614^2 .

It is a congruent number.

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 in 5 ways as a sum of consecutive naturals, for example, 15702003 + ... + 15703354.

Almost surely, 2^21230021332 is an apocalyptic number.

It is an amenable number.

21230021332 is a deficient number, since it is larger than the sum of its proper divisors (19000242266).

21230021332 is a wasteful number, since it uses less digits than its factorization.

21230021332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31405387 (or 31405372 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21230021332 its reverse (23312003212), we get a palindrome (44542024544).

The spelling of 21230021332 in words is "twenty-one billion, two hundred thirty million, twenty-one thousand, three hundred thirty-two".