212223223121 has 32 divisors (see below), whose sum is σ = 266219509248. Its totient is φ = 164686878720.

The previous prime is 212223223087. The next prime is 212223223181. The reversal of 212223223121 is 121322322212.

It is a happy number.

It is not a de Polignac number, because 212223223121 - 2¹⁰ = 212223222097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212223223181) 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, 18162401 + ... + 18174081.

It is an arithmetic number, because the mean of its divisors is an integer number (8319359664).

Almost surely, 2^212223223121 is an apocalyptic number.

It is an amenable number.

212223223121 is a deficient number, since it is larger than the sum of its proper divisors (53996286127).

212223223121 is a wasteful number, since it uses less digits than its factorization.

212223223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15521.

The product of its digits is 1152, while the sum is 23.

Adding to 212223223121 its reverse (121322322212), we get a palindrome (333545545333).

Subtracting from 212223223121 its reverse (121322322212), we obtain a palindrome (90900900909).

The spelling of 212223223121 in words is "two hundred twelve billion, two hundred twenty-three million, two hundred twenty-three thousand, one hundred twenty-one".