223123012121 has 4 divisors (see below), whose sum is σ = 232824012672. Its totient is φ = 213422011572.

The previous prime is 223123012069. The next prime is 223123012129. The reversal of 223123012121 is 121210321322.

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 a de Polignac number, because none of the positive numbers 2^k-223123012121 is a prime.

It is a super-3 number, since 3×223123012121³ (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 = 223123012093 and 223123012102.

It is not an unprimeable number, because it can be changed into a prime (223123012129) 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, 4850500241 + ... + 4850500286.

It is an arithmetic number, because the mean of its divisors is an integer number (58206003168).

Almost surely, 2^223123012121 is an apocalyptic number.

It is an amenable number.

223123012121 is a deficient number, since it is larger than the sum of its proper divisors (9701000551).

223123012121 is an equidigital number, since it uses as much as digits as its factorization.

223123012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9701000550.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 223123012121 its reverse (121210321322), we get a palindrome (344333333443).

The spelling of 223123012121 in words is "two hundred twenty-three billion, one hundred twenty-three million, twelve thousand, one hundred twenty-one".