1001211211100 has 72 divisors (see below), whose sum is σ = 2287180694400. Its totient is φ = 379372593600.

The previous prime is 1001211211087. The next prime is 1001211211103. The reversal of 1001211211100 is 11121121001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001211211103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35475995 + ... + 35504205.

Almost surely, 2^{1001211211100} is an apocalyptic number.

1001211211100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001211211100 is an abundant number, since it is smaller than the sum of its proper divisors (1285969483300).

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

1001211211100 is a wasteful number, since it uses less digits than its factorization.

1001211211100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46923 (or 46916 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1001211211100 its reverse (11121121001), we get a palindrome (1012332332101).

Subtracting from 1001211211100 its reverse (11121121001), we obtain a palindrome (990090090099).

The spelling of 1001211211100 in words is "one trillion, one billion, two hundred eleven million, two hundred eleven thousand, one hundred".