21002220312 has 32 divisors (see below), whose sum is σ = 53924622000. Its totient is φ = 6811530624.

The previous prime is 21002220293. The next prime is 21002220319. The reversal of 21002220312 is 21302220012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21002220291 and 21002220300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002220319) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11824687 + ... + 11826462.

Almost surely, 2^21002220312 is an apocalyptic number.

It is an amenable number.

21002220312 is an abundant number, since it is smaller than the sum of its proper divisors (32922401688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002220312 is a wasteful number, since it uses less digits than its factorization.

21002220312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23651195 (or 23651191 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21002220312 its reverse (21302220012), we get a palindrome (42304440324).

The spelling of 21002220312 in words is "twenty-one billion, two million, two hundred twenty thousand, three hundred twelve".