1211112012042 has 64 divisors (see below), whose sum is σ = 2771622144000. Its totient is φ = 391837917744.

The previous prime is 1211112012041. The next prime is 1211112012043. The reversal of 1211112012042 is 2402102111121.

It is an interprime number because it is at equal distance from previous prime (1211112012041) and next prime (1211112012043).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1211112012041) 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 31 ways as a sum of consecutive naturals, for example, 2154228 + ... + 2657615.

It is an arithmetic number, because the mean of its divisors is an integer number (43306596000).

Almost surely, 2^{1211112012042} is an apocalyptic number.

1211112012042 is an abundant number, since it is smaller than the sum of its proper divisors (1560510131958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211112012042 is a wasteful number, since it uses less digits than its factorization.

1211112012042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4811992 (or 4811986 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211112012042 its reverse (2402102111121), we get a palindrome (3613214123163).

The spelling of 1211112012042 in words is "one trillion, two hundred eleven billion, one hundred twelve million, twelve thousand, forty-two".