21220213321312 has 12 divisors (see below), whose sum is σ = 41777294976396. Its totient is φ = 10610106660640.

The previous prime is 21220213321199. The next prime is 21220213321387. The reversal of 21220213321312 is 21312331202212.

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 as a sum of consecutive naturals, namely, 331565833114 + ... + 331565833177.

It is an arithmetic number, because the mean of its divisors is an integer number (3481441248033).

Almost surely, 2^{21220213321312} is an apocalyptic number.

It is an amenable number.

21220213321312 is a deficient number, since it is larger than the sum of its proper divisors (20557081655084).

21220213321312 is an equidigital number, since it uses as much as digits as its factorization.

21220213321312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663131666301 (or 663131666293 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21220213321312 its reverse (21312331202212), we get a palindrome (42532544523524).

The spelling of 21220213321312 in words is "twenty-one trillion, two hundred twenty billion, two hundred thirteen million, three hundred twenty-one thousand, three hundred twelve".