21313121010221 has 32 divisors (see below), whose sum is σ = 23046177024000. Its totient is φ = 19649706487488.

The previous prime is 21313121010211. The next prime is 21313121010253. The reversal of 21313121010221 is 12201012131312.

It is a cyclic number.

It is not a de Polignac number, because 21313121010221 - 2³⁸ = 21038243103277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21313121010193 and 21313121010202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313121010211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1106648090 + ... + 1106667348.

It is an arithmetic number, because the mean of its divisors is an integer number (720193032000).

Almost surely, 2^{21313121010221} is an apocalyptic number.

It is an amenable number.

21313121010221 is a deficient number, since it is larger than the sum of its proper divisors (1733056013779).

21313121010221 is a wasteful number, since it uses less digits than its factorization.

21313121010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22073.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21313121010221 its reverse (12201012131312), we get a palindrome (33514133141533).

The spelling of 21313121010221 in words is "twenty-one trillion, three hundred thirteen billion, one hundred twenty-one million, ten thousand, two hundred twenty-one".