1200111122142 has 48 divisors (see below), whose sum is σ = 2644139058912. Its totient is φ = 393289767360.

The previous prime is 1200111122141. The next prime is 1200111122213. The reversal of 1200111122142 is 2412211110021.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200111122141) 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 23 ways as a sum of consecutive naturals, for example, 2029668 + ... + 2553384.

It is an arithmetic number, because the mean of its divisors is an integer number (55086230394).

Almost surely, 2^{1200111122142} is an apocalyptic number.

1200111122142 is an abundant number, since it is smaller than the sum of its proper divisors (1444027936770).

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

1200111122142 is a wasteful number, since it uses less digits than its factorization.

1200111122142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525873 (or 525870 counting only the distinct ones).

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

Adding to 1200111122142 its reverse (2412211110021), we get a palindrome (3612322232163).

The spelling of 1200111122142 in words is "one trillion, two hundred billion, one hundred eleven million, one hundred twenty-two thousand, one hundred forty-two".