21202110012221 has 8 divisors (see below), whose sum is σ = 22318085044800. Its totient is φ = 20086142430240.

The previous prime is 21202110012217. The next prime is 21202110012263. The reversal of 21202110012221 is 12221001120212.

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 21202110012221 - 2² = 21202110012217 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 21202110012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202110012821) 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, 4543481 + ... + 7940241.

It is an arithmetic number, because the mean of its divisors is an integer number (2789760630600).

Almost surely, 2^{21202110012221} is an apocalyptic number.

It is an amenable number.

21202110012221 is a deficient number, since it is larger than the sum of its proper divisors (1115975032579).

21202110012221 is a wasteful number, since it uses less digits than its factorization.

21202110012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725299.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21202110012221 its reverse (12221001120212), we get a palindrome (33423111132433).

The spelling of 21202110012221 in words is "twenty-one trillion, two hundred two billion, one hundred ten million, twelve thousand, two hundred twenty-one".