1210221331221 has 16 divisors (see below), whose sum is σ = 1844270467200. Its totient is φ = 691508667648.

The previous prime is 1210221331219. The next prime is 1210221331223. The reversal of 1210221331221 is 1221331220121.

It is an interprime number because it is at equal distance from previous prime (1210221331219) and next prime (1210221331223).

It is not a de Polignac number, because 1210221331221 - 2¹ = 1210221331219 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 (1210221331223) 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, 1610616 + ... + 2239313.

It is an arithmetic number, because the mean of its divisors is an integer number (115266904200).

Almost surely, 2^{1210221331221} is an apocalyptic number.

It is an amenable number.

1210221331221 is a deficient number, since it is larger than the sum of its proper divisors (634049135979).

1210221331221 is a wasteful number, since it uses less digits than its factorization.

1210221331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3864908.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1210221331221 its reverse (1221331220121), we get a palindrome (2431552551342).

The spelling of 1210221331221 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, three hundred thirty-one thousand, two hundred twenty-one".