223121340431 has 4 divisors (see below), whose sum is σ = 243405098664. Its totient is φ = 202837582200.

The previous prime is 223121340419. The next prime is 223121340439. The reversal of 223121340431 is 134043121322.

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

It is not a de Polignac number, because 223121340431 - 2²² = 223117146127 is a prime.

It is a super-3 number, since 3×223121340431³ (a number of 35 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 self number, because there is not a number n which added to its sum of digits gives 223121340431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223121340439) 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, 10141879100 + ... + 10141879121.

It is an arithmetic number, because the mean of its divisors is an integer number (60851274666).

Almost surely, 2^223121340431 is an apocalyptic number.

223121340431 is a deficient number, since it is larger than the sum of its proper divisors (20283758233).

223121340431 is a wasteful number, since it uses less digits than its factorization.

223121340431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20283758232.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 223121340431 its reverse (134043121322), we get a palindrome (357164461753).

The spelling of 223121340431 in words is "two hundred twenty-three billion, one hundred twenty-one million, three hundred forty thousand, four hundred thirty-one".