21220020032 has 28 divisors (see below), whose sum is σ = 42113431140. Its totient is φ = 10608761856.

The previous prime is 21220020001. The next prime is 21220020037. The reversal of 21220020032 is 23002002212.

It can be written as a sum of positive squares in 2 ways, for example, as 13230520576 + 7989499456 = 115024^2 + 89384^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21220019989 and 21220020016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220020037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 787844 + ... + 814332.

Almost surely, 2^21220020032 is an apocalyptic number.

It is an amenable number.

21220020032 is a deficient number, since it is larger than the sum of its proper divisors (20893411108).

21220020032 is a wasteful number, since it uses less digits than its factorization.

21220020032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39018 (or 39008 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 21220020032 its reverse (23002002212), we get a palindrome (44222022244).

It can be divided in two parts, 212200 and 20032, that added together give a palindrome (232232).

The spelling of 21220020032 in words is "twenty-one billion, two hundred twenty million, twenty thousand, thirty-two".