21302320220210 has 32 divisors (see below), whose sum is σ = 39389030723952. Its totient is φ = 8288837948160.

The previous prime is 21302320220183. The next prime is 21302320220213. The reversal of 21302320220210 is 1202202320312.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5579199893089 + 15723120327121 = 2362033^2 + 3965239^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21302320220213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4519817 + ... + 7939356.

Almost surely, 2^{21302320220210} is an apocalyptic number.

21302320220210 is a deficient number, since it is larger than the sum of its proper divisors (18086710503742).

21302320220210 is a wasteful number, since it uses less digits than its factorization.

21302320220210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12463838.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21302320220210 its reverse (1202202320312), we get a palindrome (22504522540522).

The spelling of 21302320220210 in words is "twenty-one trillion, three hundred two billion, three hundred twenty million, two hundred twenty thousand, two hundred ten".