1201020011100 has 864 divisors, whose sum is σ = 4777689652736. Its totient is φ = 245559859200.

The previous prime is 1201020011077. The next prime is 1201020011161. The reversal of 1201020011100 is 11100201021.

It is a happy number.

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

It is a congruent number.

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 287 ways as a sum of consecutive naturals, for example, 930301455 + ... + 930302745.

Almost surely, 2^{1201020011100} is an apocalyptic number.

1201020011100 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 1201020011100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2388844826368).

1201020011100 is an abundant number, since it is smaller than the sum of its proper divisors (3576669641636).

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

1201020011100 is a wasteful number, since it uses less digits than its factorization.

1201020011100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675 (or 1665 counting only the distinct ones).

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

Adding to 1201020011100 its reverse (11100201021), we get a palindrome (1212120212121).

The spelling of 1201020011100 in words is "one trillion, two hundred one billion, twenty million, eleven thousand, one hundred".