1211221201121 has 8 divisors (see below), whose sum is σ = 1215208374120. Its totient is φ = 1207240550272.

The previous prime is 1211221201117. The next prime is 1211221201129. The reversal of 1211221201121 is 1211021221121.

It can be written as a sum of positive squares in 4 ways, for example, as 27444560896 + 1183776640225 = 165664^2 + 1088015^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211221201121 - 2² = 1211221201117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211221201121.

It is not an unprimeable number, because it can be changed into a prime (1211221201129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1258370 + ... + 2001483.

It is an arithmetic number, because the mean of its divisors is an integer number (151901046765).

Almost surely, 2^{1211221201121} is an apocalyptic number.

It is an amenable number.

1211221201121 is a deficient number, since it is larger than the sum of its proper divisors (3987172999).

1211221201121 is an equidigital number, since it uses as much as digits as its factorization.

1211221201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261075.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1211221201121 its reverse (1211021221121), we get a palindrome (2422242422242).

The spelling of 1211221201121 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred one thousand, one hundred twenty-one".