223121 has 4 divisors (see below), whose sum is σ = 224112. Its totient is φ = 222132.

The previous prime is 223103. The next prime is 223129. The reversal of 223121 is 121322.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 121322 = 2 ⋅60661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223121 is a prime.

It is a super-3 number, since 3×223121³ = 33322885270801683, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223129) 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, 26 + ... + 668.

It is an arithmetic number, because the mean of its divisors is an integer number (56028).

2²²³¹²¹ is an apocalyptic number.

It is an amenable number.

223121 is a deficient number, since it is larger than the sum of its proper divisors (991).

223121 is an equidigital number, since it uses as much as digits as its factorization.

223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990.

The product of its digits is 24, while the sum is 11.

The square root of 223121 is about 472.3568566243. The cubic root of 223121 is about 60.6522359644.

Adding to 223121 its reverse (121322), we get a palindrome (344443).

The spelling of 223121 in words is "two hundred twenty-three thousand, one hundred twenty-one", and thus it is an iban number.