223331431021 has 2 divisors, whose sum is σ = 223331431022. Its totient is φ = 223331431020.

The previous prime is 223331431019. The next prime is 223331431031. The reversal of 223331431021 is 120134133322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207034100100 + 16297330921 = 455010^2 + 127661^2 .

It is a cyclic number.

It is not a de Polignac number, because 223331431021 - 2¹ = 223331431019 is a prime.

It is a super-2 number, since 2×223331431021² (a number of 23 digits) contains 22 as substring.

Together with 223331431019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223331431031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111665715510 + 111665715511.

It is an arithmetic number, because the mean of its divisors is an integer number (111665715511).

Almost surely, 2^223331431021 is an apocalyptic number.

It is an amenable number.

223331431021 is a deficient number, since it is larger than the sum of its proper divisors (1).

223331431021 is an equidigital number, since it uses as much as digits as its factorization.

223331431021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 223331431021 its reverse (120134133322), we get a palindrome (343465564343).

The spelling of 223331431021 in words is "two hundred twenty-three billion, three hundred thirty-one million, four hundred thirty-one thousand, twenty-one".