2001021222100 has 36 divisors (see below), whose sum is σ = 4531008059424. Its totient is φ = 765608118880.

The previous prime is 2001021222089. The next prime is 2001021222103. The reversal of 2001021222100 is 12221201002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001021222103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435002314 + ... + 435006913.

It is an arithmetic number, because the mean of its divisors is an integer number (125861334984).

Almost surely, 2^{2001021222100} is an apocalyptic number.

2001021222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001021222100 is an abundant number, since it is smaller than the sum of its proper divisors (2529986837324).

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

2001021222100 is a wasteful number, since it uses less digits than its factorization.

2001021222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870009264 (or 870009257 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2001021222100 its reverse (12221201002), we get a palindrome (2013242423102).

The spelling of 2001021222100 in words is "two trillion, one billion, twenty-one million, two hundred twenty-two thousand, one hundred".