2001111221220 has 96 divisors (see below), whose sum is σ = 5840436056448. Its totient is φ = 511457836032.

The previous prime is 2001111221203. The next prime is 2001111221231. The reversal of 2001111221220 is 221221111002.

It is a super-2 number, since 2×2001111221220² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2001111221220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6578137 + ... + 6875616.

It is an arithmetic number, because the mean of its divisors is an integer number (60837875588).

Almost surely, 2^{2001111221220} is an apocalyptic number.

2001111221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001111221220 is an abundant number, since it is smaller than the sum of its proper divisors (3839324835228).

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

2001111221220 is a wasteful number, since it uses less digits than its factorization.

2001111221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13453869 (or 13453867 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2001111221220 its reverse (221221111002), we get a palindrome (2222332332222).

The spelling of 2001111221220 in words is "two trillion, one billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty".