223121231 has 4 divisors (see below), whose sum is σ = 223151112. Its totient is φ = 223091352.

The previous prime is 223121207. The next prime is 223121233. The reversal of 223121231 is 132121322.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 132121322 = 2 ⋅66060661.

It is a cyclic number.

It is not a de Polignac number, because 223121231 - 2¹⁰ = 223120207 is a prime.

It is a super-3 number, since 3×223121231³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223121233) 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, 7040 + ... + 22266.

It is an arithmetic number, because the mean of its divisors is an integer number (55787778).

Almost surely, 2^223121231 is an apocalyptic number.

223121231 is a deficient number, since it is larger than the sum of its proper divisors (29881).

223121231 is a wasteful number, since it uses less digits than its factorization.

223121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29880.

The product of its digits is 144, while the sum is 17.

The square root of 223121231 is about 14937.2430856567. The cubic root of 223121231 is about 606.5225689574.

Adding to 223121231 its reverse (132121322), we get a palindrome (355242553).

Subtracting from 223121231 its reverse (132121322), we obtain a palindrome (90999909).

The spelling of 223121231 in words is "two hundred twenty-three million, one hundred twenty-one thousand, two hundred thirty-one".