2001221111010 has 128 divisors (see below), whose sum is σ = 5409371455488. Its totient is φ = 469425888000.

The previous prime is 2001221111003. The next prime is 2001221111039. The reversal of 2001221111010 is 101111221002.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114536575 + ... + 114554045.

It is an arithmetic number, because the mean of its divisors is an integer number (42260714496).

Almost surely, 2^{2001221111010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001221111010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2704685727744).

2001221111010 is an abundant number, since it is smaller than the sum of its proper divisors (3408150344478).

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

2001221111010 is a wasteful number, since it uses less digits than its factorization.

2001221111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28720.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2001221111010 its reverse (101111221002), we get a palindrome (2102332332012).

The spelling of 2001221111010 in words is "two trillion, one billion, two hundred twenty-one million, one hundred eleven thousand, ten".