1211200121011 has 2 divisors, whose sum is σ = 1211200121012. Its totient is φ = 1211200121010.

The previous prime is 1211200120981. The next prime is 1211200121041. The reversal of 1211200121011 is 1101210021121.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1211200120981) and next prime (1211200121041).

It is a cyclic number.

It is not a de Polignac number, because 1211200121011 - 2²⁵ = 1211166566579 is a prime.

It is a super-2 number, since 2×1211200121011² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211200120982 and 1211200121000.

It is not a weakly prime, because it can be changed into another prime (1211200121041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605600060505 + 605600060506.

It is an arithmetic number, because the mean of its divisors is an integer number (605600060506).

Almost surely, 2^{1211200121011} is an apocalyptic number.

1211200121011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211200121011 is an equidigital number, since it uses as much as digits as its factorization.

1211200121011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1211200121011 its reverse (1101210021121), we get a palindrome (2312410142132).

The spelling of 1211200121011 in words is "one trillion, two hundred eleven billion, two hundred million, one hundred twenty-one thousand, eleven".