1221202111121 has 8 divisors (see below), whose sum is σ = 1223271051264. Its totient is φ = 1219133732320.

The previous prime is 1221202110979. The next prime is 1221202111123. The reversal of 1221202111121 is 1211112021221.

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 1221202111121 - 2³⁰ = 1220128369297 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 1221202111121.

It is not an unprimeable number, because it can be changed into a prime (1221202111123) 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, 4334861 + ... + 4607973.

It is an arithmetic number, because the mean of its divisors is an integer number (152908881408).

Almost surely, 2^{1221202111121} is an apocalyptic number.

It is an amenable number.

1221202111121 is a deficient number, since it is larger than the sum of its proper divisors (2068940143).

1221202111121 is an equidigital number, since it uses as much as digits as its factorization.

1221202111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280671.

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

Adding to 1221202111121 its reverse (1211112021221), we get a palindrome (2432314132342).

The spelling of 1221202111121 in words is "one trillion, two hundred twenty-one billion, two hundred two million, one hundred eleven thousand, one hundred twenty-one".