3221212120221 has 16 divisors (see below), whose sum is σ = 4433195216000. Its totient is φ = 2078935201728.

The previous prime is 3221212120199. The next prime is 3221212120229. The reversal of 3221212120221 is 1220212121223.

It is not a de Polignac number, because 3221212120221 - 2⁶ = 3221212120157 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 72892306 + ... + 72936483.

It is an arithmetic number, because the mean of its divisors is an integer number (277074701000).

Almost surely, 2^{3221212120221} is an apocalyptic number.

It is an amenable number.

3221212120221 is a deficient number, since it is larger than the sum of its proper divisors (1211983095779).

3221212120221 is a wasteful number, since it uses less digits than its factorization.

3221212120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145829028.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 3221212120221 its reverse (1220212121223), we get a palindrome (4441424241444).

It can be divided in two parts, 32212121202 and 21, that added together give a palindrome (32212121223).

The spelling of 3221212120221 in words is "three trillion, two hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, two hundred twenty-one".