3220121123172 has 72 divisors (see below), whose sum is σ = 8297322493824. Its totient is φ = 1052614495296.

The previous prime is 3220121123117. The next prime is 3220121123173. The reversal of 3220121123172 is 2713211210223.

It is a happy number.

3220121123172 is a `hidden beast` number, since 3 + 220 + 12 + 112 + 317 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (3220121123173) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3569253 + ... + 4379475.

It is an arithmetic number, because the mean of its divisors is an integer number (115240590192).

Almost surely, 2^{3220121123172} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3220121123172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4148661246912).

3220121123172 is an abundant number, since it is smaller than the sum of its proper divisors (5077201370652).

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

3220121123172 is a wasteful number, since it uses less digits than its factorization.

3220121123172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812369 (or 812364 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

Adding to 3220121123172 its reverse (2713211210223), we get a palindrome (5933332333395).

The spelling of 3220121123172 in words is "three trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twenty-three thousand, one hundred seventy-two".