213223022221 has 4 divisors (see below), whose sum is σ = 232606933344. Its totient is φ = 193839111100.

The previous prime is 213223022191. The next prime is 213223022267. The reversal of 213223022221 is 122220322312.

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 a de Polignac number, because none of the positive numbers 2^k-213223022221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213223022192 and 213223022201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213223022281) 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, 9691955545 + ... + 9691955566.

It is an arithmetic number, because the mean of its divisors is an integer number (58151733336).

Almost surely, 2^213223022221 is an apocalyptic number.

It is an amenable number.

213223022221 is a deficient number, since it is larger than the sum of its proper divisors (19383911123).

213223022221 is a wasteful number, since it uses less digits than its factorization.

213223022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19383911122.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 213223022221 its reverse (122220322312), we get a palindrome (335443344533).

The spelling of 213223022221 in words is "two hundred thirteen billion, two hundred twenty-three million, twenty-two thousand, two hundred twenty-one".