223211212321 has 4 divisors (see below), whose sum is σ = 236341283652. Its totient is φ = 210081140992.

The previous prime is 223211212309. The next prime is 223211212339. The reversal of 223211212321 is 123212112322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75124779921 + 148086432400 = 274089^2 + 384820^2 .

It is not a de Polignac number, because 223211212321 - 2⁷ = 223211212193 is a prime.

It is a super-3 number, since 3×223211212321³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223211212292 and 223211212301.

It is not an unprimeable number, because it can be changed into a prime (223211213321) 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, 6565035640 + ... + 6565035673.

It is an arithmetic number, because the mean of its divisors is an integer number (59085320913).

Almost surely, 2^223211212321 is an apocalyptic number.

It is an amenable number.

223211212321 is a deficient number, since it is larger than the sum of its proper divisors (13130071331).

223211212321 is a wasteful number, since it uses less digits than its factorization.

223211212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13130071330.

The product of its digits is 576, while the sum is 22.

Adding to 223211212321 its reverse (123212112322), we get a palindrome (346423324643).

Subtracting from 223211212321 its reverse (123212112322), we obtain a palindrome (99999099999).

The spelling of 223211212321 in words is "two hundred twenty-three billion, two hundred eleven million, two hundred twelve thousand, three hundred twenty-one".