1201111222221 has 16 divisors (see below), whose sum is σ = 1781256640320. Its totient is φ = 799916141520.

The previous prime is 1201111222217. The next prime is 1201111222229. The reversal of 1201111222221 is 1222221111021.

It is not a de Polignac number, because 1201111222221 - 2² = 1201111222217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201111222194 and 1201111222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201111222229) 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, 22880890 + ... + 22933323.

It is an arithmetic number, because the mean of its divisors is an integer number (111328540020).

Almost surely, 2^{1201111222221} is an apocalyptic number.

It is an amenable number.

1201111222221 is a deficient number, since it is larger than the sum of its proper divisors (580145418099).

1201111222221 is an equidigital number, since it uses as much as digits as its factorization.

1201111222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45815193 (or 45815187 counting only the distinct ones).

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

Adding to 1201111222221 its reverse (1222221111021), we get a palindrome (2423332333242).

The spelling of 1201111222221 in words is "one trillion, two hundred one billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".