1211022021121 has 4 divisors (see below), whose sum is σ = 1321114932144. Its totient is φ = 1100929110100.

The previous prime is 1211022021061. The next prime is 1211022021151. The reversal of 1211022021121 is 1211202201121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211022021121 - 2²⁵ = 1210988466689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211022021095 and 1211022021104.

It is not an unprimeable number, because it can be changed into a prime (1211022021151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55046455495 + ... + 55046455516.

It is an arithmetic number, because the mean of its divisors is an integer number (330278733036).

Almost surely, 2^{1211022021121} is an apocalyptic number.

1211022021121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211022021121 is a deficient number, since it is larger than the sum of its proper divisors (110092911023).

1211022021121 is a wasteful number, since it uses less digits than its factorization.

1211022021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110092911022.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211022021121 its reverse (1211202201121), we get a palindrome (2422224222242).

The spelling of 1211022021121 in words is "one trillion, two hundred eleven billion, twenty-two million, twenty-one thousand, one hundred twenty-one".