21221120320312 has 48 divisors (see below), whose sum is σ = 43737821958600. Its totient is φ = 9645490641600.

The previous prime is 21221120320289. The next prime is 21221120320331. The reversal of 21221120320312 is 21302302112212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 19596487 + ... + 20651017.

Almost surely, 2^{21221120320312} is an apocalyptic number.

21221120320312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21221120320312 is an abundant number, since it is smaller than the sum of its proper divisors (22516701638288).

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

21221120320312 is a wasteful number, since it uses less digits than its factorization.

21221120320312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075348 (or 1075333 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21221120320312 its reverse (21302302112212), we get a palindrome (42523422432524).

The spelling of 21221120320312 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, three hundred twenty thousand, three hundred twelve".