21221320132 has 12 divisors (see below), whose sum is σ = 37140700716. Its totient is φ = 10609691360.

The previous prime is 21221320123. The next prime is 21221320163. The reversal of 21221320132 is 23102312212.

It can be written as a sum of positive squares in 2 ways, for example, as 9334651456 + 11886668676 = 96616^2 + 109026^2 .

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 3 ways as a sum of consecutive naturals, for example, 191719 + ... + 281422.

It is an arithmetic number, because the mean of its divisors is an integer number (3095058393).

Almost surely, 2^21221320132 is an apocalyptic number.

It is an amenable number.

21221320132 is a deficient number, since it is larger than the sum of its proper divisors (15919380584).

21221320132 is a wasteful number, since it uses less digits than its factorization.

21221320132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484358 (or 484356 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21221320132 its reverse (23102312212), we get a palindrome (44323632344).

The spelling of 21221320132 in words is "twenty-one billion, two hundred twenty-one million, three hundred twenty thousand, one hundred thirty-two".