1002220021221 has 4 divisors (see below), whose sum is σ = 1336293361632. Its totient is φ = 668146680812.

The previous prime is 1002220021189. The next prime is 1002220021223. The reversal of 1002220021221 is 1221200222001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1002220021221 - 2⁵ = 1002220021189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1002220021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002220021223) 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, 167036670201 + ... + 167036670206.

It is an arithmetic number, because the mean of its divisors is an integer number (334073340408).

Almost surely, 2^{1002220021221} is an apocalyptic number.

It is an amenable number.

1002220021221 is a deficient number, since it is larger than the sum of its proper divisors (334073340411).

1002220021221 is an equidigital number, since it uses as much as digits as its factorization.

1002220021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334073340410.

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

Adding to 1002220021221 its reverse (1221200222001), we get a palindrome (2223420243222).

The spelling of 1002220021221 in words is "one trillion, two billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".