642210223 has 2 divisors, whose sum is σ = 642210224. Its totient is φ = 642210222.

The previous prime is 642210193. The next prime is 642210269. The reversal of 642210223 is 322012246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642210223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642210194 and 642210203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642210323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321105111 + 321105112.

It is an arithmetic number, because the mean of its divisors is an integer number (321105112).

Almost surely, 2^642210223 is an apocalyptic number.

642210223 is a deficient number, since it is larger than the sum of its proper divisors (1).

642210223 is an equidigital number, since it uses as much as digits as its factorization.

642210223 is an odious number, because the sum of its binary digits is odd.

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

The square root of 642210223 is about 25341.8669990985. The cubic root of 642210223 is about 862.7647739367.

Adding to 642210223 its reverse (322012246), we get a palindrome (964222469).

The spelling of 642210223 in words is "six hundred forty-two million, two hundred ten thousand, two hundred twenty-three".