21202310221 has 8 divisors (see below), whose sum is σ = 21892679424. Its totient is φ = 20512342560.

The previous prime is 21202310219. The next prime is 21202310267. The reversal of 21202310221 is 12201320212.

It is a happy number.

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 21202310221 - 2¹ = 21202310219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202310195 and 21202310204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202310621) 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, 8841 + ... + 206113.

It is an arithmetic number, because the mean of its divisors is an integer number (2736584928).

Almost surely, 2^21202310221 is an apocalyptic number.

It is an amenable number.

21202310221 is a deficient number, since it is larger than the sum of its proper divisors (690369203).

21202310221 is a wasteful number, since it uses less digits than its factorization.

21202310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200771.

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

Adding to 21202310221 its reverse (12201320212), we get a palindrome (33403630433).

Subtracting from 21202310221 its reverse (12201320212), we obtain a palindrome (9000990009).

The spelling of 21202310221 in words is "twenty-one billion, two hundred two million, three hundred ten thousand, two hundred twenty-one".