31221222223 has 2 divisors, whose sum is σ = 31221222224. Its totient is φ = 31221222222.

The previous prime is 31221222209. The next prime is 31221222239. The reversal of 31221222223 is 32222212213.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31221222223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31221222194 and 31221222203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31221222203) 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 as a sum of consecutive naturals, namely, 15610611111 + 15610611112.

It is an arithmetic number, because the mean of its divisors is an integer number (15610611112).

Almost surely, 2^31221222223 is an apocalyptic number.

31221222223 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221222223 is an equidigital number, since it uses as much as digits as its factorization.

31221222223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 22.

Adding to 31221222223 its reverse (32222212213), we get a palindrome (63443434436).

The spelling of 31221222223 in words is "thirty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-three".