2001220021121 has 8 divisors (see below), whose sum is σ = 2016771291360. Its totient is φ = 1985685236928.

The previous prime is 2001220021111. The next prime is 2001220021133. The reversal of 2001220021121 is 1211200221002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2001220021121 - 2²² = 2001215826817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001220021096 and 2001220021105.

It is not an unprimeable number, because it can be changed into a prime (2001220021111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3877736 + ... + 4363401.

It is an arithmetic number, because the mean of its divisors is an integer number (252096411420).

Almost surely, 2^{2001220021121} is an apocalyptic number.

It is an amenable number.

2001220021121 is a deficient number, since it is larger than the sum of its proper divisors (15551270239).

2001220021121 is a wasteful number, since it uses less digits than its factorization.

2001220021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8243023.

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

Adding to 2001220021121 its reverse (1211200221002), we get a palindrome (3212420242123).

The spelling of 2001220021121 in words is "two trillion, one billion, two hundred twenty million, twenty-one thousand, one hundred twenty-one".