1001202020221 has 24 divisors (see below), whose sum is σ = 1107406750464. Its totient is φ = 904361140800.

The previous prime is 1001202020213. The next prime is 1001202020239. The reversal of 1001202020221 is 1220202021001.

It is a happy number.

It is not a de Polignac number, because 1001202020221 - 2³ = 1001202020213 is a prime.

It is a super-2 number, since 2×1001202020221² (a number of 25 digits) contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001202020281) 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 23 ways as a sum of consecutive naturals, for example, 81385771 + ... + 81398071.

It is an arithmetic number, because the mean of its divisors is an integer number (46141947936).

Almost surely, 2^{1001202020221} is an apocalyptic number.

It is an amenable number.

1001202020221 is a deficient number, since it is larger than the sum of its proper divisors (106204730243).

1001202020221 is a wasteful number, since it uses less digits than its factorization.

1001202020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22621 (or 22608 counting only the distinct ones).

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

Adding to 1001202020221 its reverse (1220202021001), we get a palindrome (2221404041222).

The spelling of 1001202020221 in words is "one trillion, one billion, two hundred two million, twenty thousand, two hundred twenty-one".