1201212212011 has 72 divisors (see below), whose sum is σ = 1615348681920. Its totient is φ = 886379687424.

The previous prime is 1201212212009. The next prime is 1201212212051. The reversal of 1201212212011 is 1102122121021.

It is not a de Polignac number, because 1201212212011 - 2¹ = 1201212212009 is a prime.

It is a super-2 number, since 2×1201212212011² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1201212212051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8651806 + ... + 8789548.

It is an arithmetic number, because the mean of its divisors is an integer number (22435398360).

Almost surely, 2^{1201212212011} is an apocalyptic number.

1201212212011 is a deficient number, since it is larger than the sum of its proper divisors (414136469909).

1201212212011 is a wasteful number, since it uses less digits than its factorization.

1201212212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137841 (or 137815 counting only the distinct ones).

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

Adding to 1201212212011 its reverse (1102122121021), we get a palindrome (2303334333032).

The spelling of 1201212212011 in words is "one trillion, two hundred one billion, two hundred twelve million, two hundred twelve thousand, eleven".