1201212011111 has 48 divisors (see below), whose sum is σ = 1413299404800. Its totient is φ = 1017933396480.

The previous prime is 1201212011047. The next prime is 1201212011119. The reversal of 1201212011111 is 1111102121021.

It is not a de Polignac number, because 1201212011111 - 2⁶ = 1201212011047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201212011119) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1978932170 + ... + 1978932776.

It is an arithmetic number, because the mean of its divisors is an integer number (29443737600).

Almost surely, 2^{1201212011111} is an apocalyptic number.

1201212011111 is a deficient number, since it is larger than the sum of its proper divisors (212087393689).

1201212011111 is a wasteful number, since it uses less digits than its factorization.

1201212011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764 (or 1757 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1201212011111 its reverse (1111102121021), we get a palindrome (2312314132132).

The spelling of 1201212011111 in words is "one trillion, two hundred one billion, two hundred twelve million, eleven thousand, one hundred eleven".