321220113212 has 24 divisors (see below), whose sum is σ = 612125446800. Its totient is φ = 146910105216.

The previous prime is 321220113169. The next prime is 321220113251. The reversal of 321220113212 is 212311022123.

It is a super-2 number, since 2×321220113212² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72869873 + ... + 72874280.

It is an arithmetic number, because the mean of its divisors is an integer number (25505226950).

Almost surely, 2^321220113212 is an apocalyptic number.

It is an amenable number.

321220113212 is a deficient number, since it is larger than the sum of its proper divisors (290905333588).

321220113212 is a wasteful number, since it uses less digits than its factorization.

321220113212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145744205 (or 145744203 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 321220113212 its reverse (212311022123), we get a palindrome (533531135335).

The spelling of 321220113212 in words is "three hundred twenty-one billion, two hundred twenty million, one hundred thirteen thousand, two hundred twelve".