221231222020213 has 4 divisors (see below), whose sum is σ = 221439341703328. Its totient is φ = 221023102337100.

The previous prime is 221231222020189. The next prime is 221231222020217. The reversal of 221231222020213 is 312020222132122.

221231222020213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221231222020213 - 2²⁹ = 221230685149301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221231222020217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104059839963 + ... + 104059842088.

It is an arithmetic number, because the mean of its divisors is an integer number (55359835425832).

Almost surely, 2^{221231222020213} is an apocalyptic number.

It is an amenable number.

221231222020213 is a deficient number, since it is larger than the sum of its proper divisors (208119683115).

221231222020213 is a wasteful number, since it uses less digits than its factorization.

221231222020213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208119683114.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 221231222020213 its reverse (312020222132122), we get a palindrome (533251444152335).

The spelling of 221231222020213 in words is "two hundred twenty-one trillion, two hundred thirty-one billion, two hundred twenty-two million, twenty thousand, two hundred thirteen".