321211220022 has 144 divisors (see below), whose sum is σ = 874646712576. Its totient is φ = 83394669600.

The previous prime is 321211220003. The next prime is 321211220059. The reversal of 321211220022 is 220022112123.

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 = 321211219977 and 321211220004.

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 59624413 + ... + 59629799.

It is an arithmetic number, because the mean of its divisors is an integer number (6073935504).

Almost surely, 2^321211220022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321211220022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (437323356288).

321211220022 is an abundant number, since it is smaller than the sum of its proper divisors (553435492554).

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

321211220022 is a wasteful number, since it uses less digits than its factorization.

321211220022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9335 (or 9321 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 321211220022 its reverse (220022112123), we get a palindrome (541233332145).

The spelling of 321211220022 in words is "three hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, twenty-two".