1002021220221 has 64 divisors (see below), whose sum is σ = 1617851289600. Its totient is φ = 538876800000.

The previous prime is 1002021220181. The next prime is 1002021220261. The reversal of 1002021220221 is 1220221202001.

It is an interprime number because it is at equal distance from previous prime (1002021220181) and next prime (1002021220261).

It is not a de Polignac number, because 1002021220221 - 2⁶ = 1002021220157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1002021220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002021220261) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 72862096 + ... + 72875846.

It is an arithmetic number, because the mean of its divisors is an integer number (25278926400).

Almost surely, 2^{1002021220221} is an apocalyptic number.

It is an amenable number.

1002021220221 is a deficient number, since it is larger than the sum of its proper divisors (615830069379).

1002021220221 is a wasteful number, since it uses less digits than its factorization.

1002021220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14970.

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

Adding to 1002021220221 its reverse (1220221202001), we get a palindrome (2222242422222).

The spelling of 1002021220221 in words is "one trillion, two billion, twenty-one million, two hundred twenty thousand, two hundred twenty-one".