210000123 has 24 divisors (see below), whose sum is σ = 313196000. Its totient is φ = 135489024.

The previous prime is 210000113. The next prime is 210000139. The reversal of 210000123 is 321000012.

It is a happy number.

210000123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 210000123 - 2¹³ = 209991931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210000113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64683 + ... + 67851.

Almost surely, 2^210000123 is an apocalyptic number.

210000123 is a deficient number, since it is larger than the sum of its proper divisors (103195877).

210000123 is a wasteful number, since it uses less digits than its factorization.

210000123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3411 (or 3408 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 210000123 is about 14491.3809900920. The cubic root of 210000123 is about 594.3923113243.

Adding to 210000123 its reverse (321000012), we get a palindrome (531000135).

It can be divided in two parts, 21000012 and 3, that multiplied together give a palindrome (63000036).

The spelling of 210000123 in words is "two hundred ten million, one hundred twenty-three", and thus it is an aban number.