211231202223221 has 4 divisors (see below), whose sum is σ = 222348633919200. Its totient is φ = 200113770527244.

The previous prime is 211231202223179. The next prime is 211231202223257. The reversal of 211231202223221 is 122322202132112.

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 211231202223221 - 2¹⁰ = 211231202222197 is a prime.

It is a super-2 number, since 2×211231202223221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211231202223521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5558715847961 + ... + 5558715847998.

It is an arithmetic number, because the mean of its divisors is an integer number (55587158479800).

Almost surely, 2^{211231202223221} is an apocalyptic number.

It is an amenable number.

211231202223221 is a deficient number, since it is larger than the sum of its proper divisors (11117431695979).

211231202223221 is a wasteful number, since it uses less digits than its factorization.

211231202223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11117431695978.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 211231202223221 its reverse (122322202132112), we get a palindrome (333553404355333).

The spelling of 211231202223221 in words is "two hundred eleven trillion, two hundred thirty-one billion, two hundred two million, two hundred twenty-three thousand, two hundred twenty-one".