1200001102020 has 288 divisors, whose sum is σ = 4316014230528. Its totient is φ = 274162879872.

The previous prime is 1200001101983. The next prime is 1200001102051. The reversal of 1200001102020 is 202011000021.

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 = 1200001101993 and 1200001102011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 91269087 + ... + 91282233.

Almost surely, 2^{1200001102020} is an apocalyptic number.

1200001102020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1200001102020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2158007115264).

1200001102020 is an abundant number, since it is smaller than the sum of its proper divisors (3116013128508).

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

1200001102020 is a wasteful number, since it uses less digits than its factorization.

1200001102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15861 (or 15847 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1200001102020 its reverse (202011000021), we get a palindrome (1402012102041).

The spelling of 1200001102020 in words is "one trillion, two hundred billion, one million, one hundred two thousand, twenty".