210020123 has 4 divisors (see below), whose sum is σ = 210192240. Its totient is φ = 209848008.

The previous prime is 210020101. The next prime is 210020137. The reversal of 210020123 is 321020012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 210020123 - 2¹⁸ = 209757979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218020123) 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 in 3 ways as a sum of consecutive naturals, for example, 84215 + ... + 86672.

It is an arithmetic number, because the mean of its divisors is an integer number (52548060).

Almost surely, 2^210020123 is an apocalyptic number.

210020123 is a deficient number, since it is larger than the sum of its proper divisors (172117).

210020123 is a wasteful number, since it uses less digits than its factorization.

210020123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172116.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 210020123 is about 14492.0710390199. The cubic root of 210020123 is about 594.4111803114.

Adding to 210020123 its reverse (321020012), we get a palindrome (531040135).

The spelling of 210020123 in words is "two hundred ten million, twenty thousand, one hundred twenty-three".