221344423031 has 2 divisors, whose sum is σ = 221344423032. Its totient is φ = 221344423030.

The previous prime is 221344422997. The next prime is 221344423033. The reversal of 221344423031 is 130324443122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221344423031 - 2²² = 221340228727 is a prime.

It is a super-2 number, since 2×221344423031² (a number of 23 digits) contains 22 as substring.

Together with 221344423033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221344422985 and 221344423003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221344423033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110672211515 + 110672211516.

It is an arithmetic number, because the mean of its divisors is an integer number (110672211516).

Almost surely, 2^221344423031 is an apocalyptic number.

221344423031 is a deficient number, since it is larger than the sum of its proper divisors (1).

221344423031 is an equidigital number, since it uses as much as digits as its factorization.

221344423031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 221344423031 its reverse (130324443122), we get a palindrome (351668866153).

The spelling of 221344423031 in words is "two hundred twenty-one billion, three hundred forty-four million, four hundred twenty-three thousand, thirty-one".