21002200202101 has 4 divisors (see below), whose sum is σ = 21038981639104. Its totient is φ = 20965418765100.

The previous prime is 21002200202099. The next prime is 21002200202173. The reversal of 21002200202101 is 10120200220012.

It is a happy number.

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 21002200202101 - 2¹ = 21002200202099 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 (21002200262101) 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, 18390717645 + ... + 18390718786.

It is an arithmetic number, because the mean of its divisors is an integer number (5259745409776).

Almost surely, 2^{21002200202101} is an apocalyptic number.

It is an amenable number.

21002200202101 is a deficient number, since it is larger than the sum of its proper divisors (36781437003).

21002200202101 is an equidigital number, since it uses as much as digits as its factorization.

21002200202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36781437002.

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

Adding to 21002200202101 its reverse (10120200220012), we get a palindrome (31122400422113).

The spelling of 21002200202101 in words is "twenty-one trillion, two billion, two hundred million, two hundred two thousand, one hundred one".