1002001202221 has 4 divisors (see below), whose sum is σ = 1002340521532. Its totient is φ = 1001661882912.

The previous prime is 1002001202171. The next prime is 1002001202269. The reversal of 1002001202221 is 1222021002001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 555695702500 + 446305499721 = 745450^2 + 668061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002001202221 - 2⁹ = 1002001201709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002001202821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169655226 + ... + 169661131.

It is an arithmetic number, because the mean of its divisors is an integer number (250585130383).

Almost surely, 2^{1002001202221} is an apocalyptic number.

It is an amenable number.

1002001202221 is a deficient number, since it is larger than the sum of its proper divisors (339319311).

1002001202221 is an equidigital number, since it uses as much as digits as its factorization.

1002001202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339319310.

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

Adding to 1002001202221 its reverse (1222021002001), we get a palindrome (2224022204222).

The spelling of 1002001202221 in words is "one trillion, two billion, one million, two hundred two thousand, two hundred twenty-one".