1211012220011 has 16 divisors (see below), whose sum is σ = 1345270519296. Its totient is φ = 1080910320000.

The previous prime is 1211012219999. The next prime is 1211012220023. The reversal of 1211012220011 is 1100222101121.

It is an interprime number because it is at equal distance from previous prime (1211012219999) and next prime (1211012220023).

It is a cyclic number.

It is not a de Polignac number, because 1211012220011 - 2¹⁰ = 1211012218987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211012220511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3028775 + ... + 3405216.

It is an arithmetic number, because the mean of its divisors is an integer number (84079407456).

Almost surely, 2^{1211012220011} is an apocalyptic number.

1211012220011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211012220011 is a deficient number, since it is larger than the sum of its proper divisors (134258299285).

1211012220011 is a wasteful number, since it uses less digits than its factorization.

1211012220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6434314.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211012220011 its reverse (1100222101121), we get a palindrome (2311234321132).

The spelling of 1211012220011 in words is "one trillion, two hundred eleven billion, twelve million, two hundred twenty thousand, eleven".