1201112221221 has 96 divisors (see below), whose sum is σ = 1978051246080. Its totient is φ = 722287368000.

The previous prime is 1201112221219. The next prime is 1201112221237. The reversal of 1201112221221 is 1221222111021.

It is not a de Polignac number, because 1201112221221 - 2¹ = 1201112221219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201112221194 and 1201112221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201112221261) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 673645896 + ... + 673647678.

It is an arithmetic number, because the mean of its divisors is an integer number (20604700480).

Almost surely, 2^{1201112221221} is an apocalyptic number.

1201112221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201112221221 is a deficient number, since it is larger than the sum of its proper divisors (776939024859).

1201112221221 is a wasteful number, since it uses less digits than its factorization.

1201112221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3629 (or 3617 counting only the distinct ones).

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

Adding to 1201112221221 its reverse (1221222111021), we get a palindrome (2422334332242).

The spelling of 1201112221221 in words is "one trillion, two hundred one billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".