2001201220100 has 36 divisors (see below), whose sum is σ = 4531415637504. Its totient is φ = 765676987680.

The previous prime is 2001201220001. The next prime is 2001201220157. The reversal of 2001201220100 is 10221021002.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435041444 + ... + 435046043.

Almost surely, 2^{2001201220100} is an apocalyptic number.

2001201220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001201220100 is an abundant number, since it is smaller than the sum of its proper divisors (2530214417404).

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

2001201220100 is a wasteful number, since it uses less digits than its factorization.

2001201220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870087524 (or 870087517 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2001201220100 its reverse (10221021002), we get a palindrome (2011422241102).

The spelling of 2001201220100 in words is "two trillion, one billion, two hundred one million, two hundred twenty thousand, one hundred".