2111213223221 has 4 divisors (see below), whose sum is σ = 2130944188032. Its totient is φ = 2091482258412.

The previous prime is 2111213223167. The next prime is 2111213223257. The reversal of 2111213223221 is 1223223121112.

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 2111213223221 - 2⁶ = 2111213223157 is a prime.

It is a super-2 number, since 2×2111213223221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111213223271) 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, 9865482245 + ... + 9865482458.

It is an arithmetic number, because the mean of its divisors is an integer number (532736047008).

Almost surely, 2^{2111213223221} is an apocalyptic number.

It is an amenable number.

2111213223221 is a deficient number, since it is larger than the sum of its proper divisors (19730964811).

2111213223221 is a wasteful number, since it uses less digits than its factorization.

2111213223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19730964810.

The product of its digits is 576, while the sum is 23.

Adding to 2111213223221 its reverse (1223223121112), we get a palindrome (3334436344333).

The spelling of 2111213223221 in words is "two trillion, one hundred eleven billion, two hundred thirteen million, two hundred twenty-three thousand, two hundred twenty-one".