210123923 has 2 divisors, whose sum is σ = 210123924. Its totient is φ = 210123922.

The previous prime is 210123917. The next prime is 210123931. The reversal of 210123923 is 329321012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210123923 is a prime.

It is not a weakly prime, because it can be changed into another prime (210123973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105061961 + 105061962.

It is an arithmetic number, because the mean of its divisors is an integer number (105061962).

Almost surely, 2^210123923 is an apocalyptic number.

210123923 is a deficient number, since it is larger than the sum of its proper divisors (1).

210123923 is an equidigital number, since it uses as much as digits as its factorization.

210123923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 210123923 is about 14495.6518653008. The cubic root of 210123923 is about 594.5090911173.

Adding to 210123923 its reverse (329321012), we get a palindrome (539444935).

The spelling of 210123923 in words is "two hundred ten million, one hundred twenty-three thousand, nine hundred twenty-three".