21202120202201 has 4 divisors (see below), whose sum is σ = 21308663520000. Its totient is φ = 21095576884404.

The previous prime is 21202120202189. The next prime is 21202120202251. The reversal of 21202120202201 is 10220202120212.

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 21202120202201 - 2¹⁰ = 21202120201177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21202120202201.

It is not an unprimeable number, because it can be changed into a prime (21202120202251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53271658601 + ... + 53271658998.

It is an arithmetic number, because the mean of its divisors is an integer number (5327165880000).

Almost surely, 2^{21202120202201} is an apocalyptic number.

It is an amenable number.

21202120202201 is a deficient number, since it is larger than the sum of its proper divisors (106543317799).

21202120202201 is a wasteful number, since it uses less digits than its factorization.

21202120202201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106543317798.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21202120202201 its reverse (10220202120212), we get a palindrome (31422322322413).

The spelling of 21202120202201 in words is "twenty-one trillion, two hundred two billion, one hundred twenty million, two hundred two thousand, two hundred one".