3221212120220 has 24 divisors (see below), whose sum is σ = 6792849000000. Its totient is φ = 1283093696192.

The previous prime is 3221212120199. The next prime is 3221212120229. The reversal of 3221212120220 is 220212121223.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 3221212120192 and 3221212120201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221212120229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336942095 + ... + 336951654.

It is an arithmetic number, because the mean of its divisors is an integer number (283035375000).

Almost surely, 2^{3221212120220} is an apocalyptic number.

It is an amenable number.

3221212120220 is an abundant number, since it is smaller than the sum of its proper divisors (3571636879780).

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

3221212120220 is a wasteful number, since it uses less digits than its factorization.

3221212120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673893997 (or 673893995 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 3221212120220 its reverse (220212121223), we get a palindrome (3441424241443).

The spelling of 3221212120220 in words is "three trillion, two hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, two hundred twenty".