21002002223101 has 8 divisors (see below), whose sum is σ = 21606582010104. Its totient is φ = 20401819380480.

The previous prime is 21002002223099. The next prime is 21002002223161. The reversal of 21002002223101 is 10132220020012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4767212025 + 20997235011076 = 69045^2 + 4582274^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21002002223101 - 2¹ = 21002002223099 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 (21002002223161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1099226406 + ... + 1099245511.

It is an arithmetic number, because the mean of its divisors is an integer number (2700822751263).

Almost surely, 2^{21002002223101} is an apocalyptic number.

It is an amenable number.

21002002223101 is a deficient number, since it is larger than the sum of its proper divisors (604579787003).

21002002223101 is a wasteful number, since it uses less digits than its factorization.

21002002223101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198472191.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21002002223101 its reverse (10132220020012), we get a palindrome (31134222243113).

The spelling of 21002002223101 in words is "twenty-one trillion, two billion, two million, two hundred twenty-three thousand, one hundred one".