2001221220110 has 48 divisors (see below), whose sum is σ = 4190445958320. Its totient is φ = 686111086080.

The previous prime is 2001221220079. The next prime is 2001221220121. The reversal of 2001221220110 is 110221221002.

It is a Harshad number since it is a multiple of its sum of digits (14).

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, 25598261 + ... + 25676319.

It is an arithmetic number, because the mean of its divisors is an integer number (87300957465).

Almost surely, 2^{2001221220110} is an apocalyptic number.

2001221220110 is an abundant number, since it is smaller than the sum of its proper divisors (2189224738210).

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

2001221220110 is a wasteful number, since it uses less digits than its factorization.

2001221220110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130401 (or 130394 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001221220110 its reverse (110221221002), we get a palindrome (2111442441112).

The spelling of 2001221220110 in words is "two trillion, one billion, two hundred twenty-one million, two hundred twenty thousand, one hundred ten".