1200001021110 has 96 divisors (see below), whose sum is σ = 3204666840960. Its totient is φ = 311318601984.

The previous prime is 1200001021091. The next prime is 1200001021111. The reversal of 1200001021110 is 111201000021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1200001021092 and 1200001021101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200001021111) 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, 56409556 + ... + 56430824.

It is an arithmetic number, because the mean of its divisors is an integer number (33381946260).

Almost surely, 2^{1200001021110} is an apocalyptic number.

1200001021110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1200001021110 is an abundant number, since it is smaller than the sum of its proper divisors (2004665819850).

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

1200001021110 is a wasteful number, since it uses less digits than its factorization.

1200001021110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38262 (or 38259 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1200001021110 its reverse (111201000021), we get a palindrome (1311202021131).

The spelling of 1200001021110 in words is "one trillion, two hundred billion, one million, twenty-one thousand, one hundred ten".