1211121022011 has 4 divisors (see below), whose sum is σ = 1614828029352. Its totient is φ = 807414014672.

The previous prime is 1211121021967. The next prime is 1211121022061. The reversal of 1211121022011 is 1102201211121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211121022011 - 2¹³ = 1211121013819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211121022061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201853503666 + ... + 201853503671.

It is an arithmetic number, because the mean of its divisors is an integer number (403707007338).

Almost surely, 2^{1211121022011} is an apocalyptic number.

1211121022011 is a deficient number, since it is larger than the sum of its proper divisors (403707007341).

1211121022011 is an equidigital number, since it uses as much as digits as its factorization.

1211121022011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403707007340.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211121022011 its reverse (1102201211121), we get a palindrome (2313322233132).

The spelling of 1211121022011 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, twenty-two thousand, eleven".