321121211220 has 72 divisors (see below), whose sum is σ = 1025334404640. Its totient is φ = 81125357760.

The previous prime is 321121211207. The next prime is 321121211269. The reversal of 321121211220 is 22112121123.

321121211220 is a `hidden beast` number, since 3 + 211 + 21 + 211 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 321121211193 and 321121211202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46944126 + ... + 46950965.

It is an arithmetic number, because the mean of its divisors is an integer number (14240755620).

Almost surely, 2^321121211220 is an apocalyptic number.

321121211220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

321121211220 is an abundant number, since it is smaller than the sum of its proper divisors (704213193420).

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

321121211220 is a wasteful number, since it uses less digits than its factorization.

321121211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93895125 (or 93895120 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 321121211220 its reverse (22112121123), we get a palindrome (343233332343).

The spelling of 321121211220 in words is "three hundred twenty-one billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty".