2001120220021 has 16 divisors (see below), whose sum is σ = 2157092230720. Its totient is φ = 1845440288640.

The previous prime is 2001120220019. The next prime is 2001120220031. The reversal of 2001120220021 is 1200220211002.

It is a happy number.

It is not a de Polignac number, because 2001120220021 - 2¹ = 2001120220019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001120219983 and 2001120220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001120220031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87293641 + ... + 87316561.

It is an arithmetic number, because the mean of its divisors is an integer number (134818264420).

Almost surely, 2^{2001120220021} is an apocalyptic number.

It is an amenable number.

2001120220021 is a deficient number, since it is larger than the sum of its proper divisors (155972010699).

2001120220021 is a wasteful number, since it uses less digits than its factorization.

2001120220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28996.

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

Adding to 2001120220021 its reverse (1200220211002), we get a palindrome (3201340431023).

The spelling of 2001120220021 in words is "two trillion, one billion, one hundred twenty million, two hundred twenty thousand, twenty-one".