1211122120121 has 8 divisors (see below), whose sum is σ = 1235108749824. Its totient is φ = 1187177537520.

The previous prime is 1211122120111. The next prime is 1211122120123. The reversal of 1211122120121 is 1210212211121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211122120121 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 1211122120121.

It is not an unprimeable number, because it can be changed into a prime (1211122120123) 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, 10453595 + ... + 10568816.

It is an arithmetic number, because the mean of its divisors is an integer number (154388593728).

Almost surely, 2^{1211122120121} is an apocalyptic number.

It is an amenable number.

1211122120121 is a deficient number, since it is larger than the sum of its proper divisors (23986629703).

1211122120121 is a wasteful number, since it uses less digits than its factorization.

1211122120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21023551.

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

Adding to 1211122120121 its reverse (1210212211121), we get a palindrome (2421334331242).

The spelling of 1211122120121 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, one hundred twenty thousand, one hundred twenty-one".