1211021122011 has 32 divisors (see below), whose sum is σ = 1669690713600. Its totient is φ = 780408541440.

The previous prime is 1211021121923. The next prime is 1211021122027. The reversal of 1211021122011 is 1102211201121.

It is a happy number.

It is not a de Polignac number, because 1211021122011 - 2⁷ = 1211021121883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211021122111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2638930 + ... + 3063656.

It is an arithmetic number, because the mean of its divisors is an integer number (52177834800).

Almost surely, 2^{1211021122011} is an apocalyptic number.

1211021122011 is a deficient number, since it is larger than the sum of its proper divisors (458669591589).

1211021122011 is a wasteful number, since it uses less digits than its factorization.

1211021122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425059.

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

Adding to 1211021122011 its reverse (1102211201121), we get a palindrome (2313232323132).

The spelling of 1211021122011 in words is "one trillion, two hundred eleven billion, twenty-one million, one hundred twenty-two thousand, eleven".