1210220323221 has 32 divisors (see below), whose sum is σ = 1986123962368. Its totient is φ = 638318957760.

The previous prime is 1210220323217. The next prime is 1210220323223. The reversal of 1210220323221 is 1223230220121.

It is not a de Polignac number, because 1210220323221 - 2² = 1210220323217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210220323223) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 4648320 + ... + 4901766.

It is an arithmetic number, because the mean of its divisors is an integer number (62066373824).

Almost surely, 2^{1210220323221} is an apocalyptic number.

It is an amenable number.

1210220323221 is a deficient number, since it is larger than the sum of its proper divisors (775903639147).

1210220323221 is a wasteful number, since it uses less digits than its factorization.

1210220323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270961.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1210220323221 its reverse (1223230220121), we get a palindrome (2433450543342).

The spelling of 1210220323221 in words is "one trillion, two hundred ten billion, two hundred twenty million, three hundred twenty-three thousand, two hundred twenty-one".