2001202201021 has 32 divisors (see below), whose sum is σ = 2145724408800. Its totient is φ = 1862850232320.

The previous prime is 2001202200997. The next prime is 2001202201051. The reversal of 2001202201021 is 1201022021002.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 1431705578521 + 569496622500 = 1196539^2 + 754650^2 .

It is not a de Polignac number, because 2001202201021 - 2¹¹ = 2001202198973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001202200992 and 2001202201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001202201051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243066721 + ... + 243074953.

It is an arithmetic number, because the mean of its divisors is an integer number (67053887775).

Almost surely, 2^{2001202201021} is an apocalyptic number.

It is an amenable number.

2001202201021 is a deficient number, since it is larger than the sum of its proper divisors (144522207779).

2001202201021 is a wasteful number, since it uses less digits than its factorization.

2001202201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10689.

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

Adding to 2001202201021 its reverse (1201022021002), we get a palindrome (3202224222023).

The spelling of 2001202201021 in words is "two trillion, one billion, two hundred two million, two hundred one thousand, twenty-one".