21210022102201 has 4 divisors (see below), whose sum is σ = 22457670461172. Its totient is φ = 19962373743232.

The previous prime is 21210022102177. The next prime is 21210022102219. The reversal of 21210022102201 is 10220122001212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16729539710976 + 4480482391225 = 4090176^2 + 2116715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210022102201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210022192201) 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, 623824179460 + ... + 623824179493.

It is an arithmetic number, because the mean of its divisors is an integer number (5614417615293).

Almost surely, 2^{21210022102201} is an apocalyptic number.

It is an amenable number.

21210022102201 is a deficient number, since it is larger than the sum of its proper divisors (1247648358971).

21210022102201 is a wasteful number, since it uses less digits than its factorization.

21210022102201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247648358970.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21210022102201 its reverse (10220122001212), we get a palindrome (31430144103413).

The spelling of 21210022102201 in words is "twenty-one trillion, two hundred ten billion, twenty-two million, one hundred two thousand, two hundred one".