1001021201100 has 144 divisors (see below), whose sum is σ = 3246577518240. Its totient is φ = 264576614400.

The previous prime is 1001021201099. The next prime is 1001021201107. The reversal of 1001021201100 is 11021201001.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1001021201107) 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, 1335381 + ... + 1945580.

It is an arithmetic number, because the mean of its divisors is an integer number (22545677210).

Almost surely, 2^{1001021201100} is an apocalyptic number.

1001021201100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001021201100 is an abundant number, since it is smaller than the sum of its proper divisors (2245556317140).

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

1001021201100 is a wasteful number, since it uses less digits than its factorization.

1001021201100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281097 (or 3281084 counting only the distinct ones).

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

Adding to 1001021201100 its reverse (11021201001), we get a palindrome (1012042402101).

Subtracting from 1001021201100 its reverse (11021201001), we obtain a palindrome (990000000099).

The spelling of 1001021201100 in words is "one trillion, one billion, twenty-one million, two hundred one thousand, one hundred".