2001220211100 has 72 divisors (see below), whose sum is σ = 6316578713088. Its totient is φ = 485144292800.

The previous prime is 2001220211063. The next prime is 2001220211171. The reversal of 2001220211100 is 11120221002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 303211884 + ... + 303218483.

It is an arithmetic number, because the mean of its divisors is an integer number (87730259904).

Almost surely, 2^{2001220211100} is an apocalyptic number.

2001220211100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001220211100 is an abundant number, since it is smaller than the sum of its proper divisors (4315358501988).

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

2001220211100 is a wasteful number, since it uses less digits than its factorization.

2001220211100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606430395 (or 606430388 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 2001220211100 its reverse (11120221002), we get a palindrome (2012340432102).

The spelling of 2001220211100 in words is "two trillion, one billion, two hundred twenty million, two hundred eleven thousand, one hundred".