1210112221221 has 12 divisors (see below), whose sum is σ = 1765246211820. Its totient is φ = 798753940800.

The previous prime is 1210112221217. The next prime is 1210112221243. The reversal of 1210112221221 is 1221222110121.

1210112221221 is a `hidden beast` number, since 1 + 210 + 1 + 12 + 221 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 709824785121 + 500287436100 = 842511^2 + 707310^2 .

It is not a de Polignac number, because 1210112221221 - 2² = 1210112221217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210112221194 and 1210112221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210112221211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 665627376 + ... + 665629193.

It is an arithmetic number, because the mean of its divisors is an integer number (147103850985).

Almost surely, 2^{1210112221221} is an apocalyptic number.

It is an amenable number.

1210112221221 is a deficient number, since it is larger than the sum of its proper divisors (555133990599).

1210112221221 is a wasteful number, since it uses less digits than its factorization.

1210112221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331256676 (or 1331256673 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1210112221221 its reverse (1221222110121), we get a palindrome (2431334331342).

The spelling of 1210112221221 in words is "one trillion, two hundred ten billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".