2001220212021 has 8 divisors (see below), whose sum is σ = 2684271422784. Its totient is φ = 1326157904640.

The previous prime is 2001220211909. The next prime is 2001220212071. The reversal of 2001220212021 is 1202120221002.

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

It is not a de Polignac number, because 2001220212021 - 2³⁵ = 1966860473653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001220212071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1997225260 + ... + 1997226261.

It is an arithmetic number, because the mean of its divisors is an integer number (335533927848).

Almost surely, 2^{2001220212021} is an apocalyptic number.

It is an amenable number.

2001220212021 is a deficient number, since it is larger than the sum of its proper divisors (683051210763).

2001220212021 is a wasteful number, since it uses less digits than its factorization.

2001220212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994451691.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2001220212021 its reverse (1202120221002), we get a palindrome (3203340433023).

The spelling of 2001220212021 in words is "two trillion, one billion, two hundred twenty million, two hundred twelve thousand, twenty-one".