221223131431 has 4 divisors (see below), whose sum is σ = 221224392000. Its totient is φ = 221221870864.

The previous prime is 221223131419. The next prime is 221223131489. The reversal of 221223131431 is 134131322122.

221223131431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221223131431 - 2²⁹ = 220686260519 is a prime.

It is a super-2 number, since 2×221223131431² (a number of 23 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 = 221223131396 and 221223131405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221223131411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314206 + ... + 735643.

It is an arithmetic number, because the mean of its divisors is an integer number (55306098000).

Almost surely, 2^221223131431 is an apocalyptic number.

221223131431 is a deficient number, since it is larger than the sum of its proper divisors (1260569).

221223131431 is a wasteful number, since it uses less digits than its factorization.

221223131431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260568.

The product of its digits is 1728, while the sum is 25.

Adding to 221223131431 its reverse (134131322122), we get a palindrome (355354453553).

The spelling of 221223131431 in words is "two hundred twenty-one billion, two hundred twenty-three million, one hundred thirty-one thousand, four hundred thirty-one".