18233121223 has 4 divisors (see below), whose sum is σ = 19025865648. Its totient is φ = 17440376800.

The previous prime is 18233121217. The next prime is 18233121233. The reversal of 18233121223 is 32212133281.

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

It is a cyclic number.

It is not a de Polignac number, because 18233121223 - 2²⁹ = 17696250311 is a prime.

It is a super-2 number, since 2×18233121223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18233121191 and 18233121200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18233121233) 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, 396372178 + ... + 396372223.

It is an arithmetic number, because the mean of its divisors is an integer number (4756466412).

Almost surely, 2^18233121223 is an apocalyptic number.

18233121223 is a deficient number, since it is larger than the sum of its proper divisors (792744425).

18233121223 is an equidigital number, since it uses as much as digits as its factorization.

18233121223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792744424.

The product of its digits is 3456, while the sum is 28.

The spelling of 18233121223 in words is "eighteen billion, two hundred thirty-three million, one hundred twenty-one thousand, two hundred twenty-three".