1011200120100 has 90 divisors (see below), whose sum is σ = 3277911329154. Its totient is φ = 269653363200.

The previous prime is 1011200120093. The next prime is 1011200120113. The reversal of 1011200120100 is 10210021101.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 463454784 + 1010736665316 = 21528^2 + 1005354^2 .

It is a tau number, because it is divible by the number of its divisors (90).

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

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 29 ways as a sum of consecutive naturals, for example, 62411661 + ... + 62427860.

Almost surely, 2^{1011200120100} is an apocalyptic number.

1011200120100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011200120100 is an abundant number, since it is smaller than the sum of its proper divisors (2266711209054).

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

1011200120100 is a wasteful number, since it uses less digits than its factorization.

1011200120100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124839547 (or 124839531 counting only the distinct ones).

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

Adding to 1011200120100 its reverse (10210021101), we get a palindrome (1021410141201).

The spelling of 1011200120100 in words is "one trillion, eleven billion, two hundred million, one hundred twenty thousand, one hundred".