123021403 has 4 divisors (see below), whose sum is σ = 123847200. Its totient is φ = 122195608.

The previous prime is 123021397. The next prime is 123021413. The reversal of 123021403 is 304120321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304120321 = 11969 ⋅25409.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123021403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123021413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412675 + ... + 412972.

It is an arithmetic number, because the mean of its divisors is an integer number (30961800).

Almost surely, 2^123021403 is an apocalyptic number.

123021403 is a deficient number, since it is larger than the sum of its proper divisors (825797).

123021403 is an equidigital number, since it uses as much as digits as its factorization.

123021403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825796.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 123021403 is about 11091.5013861966. The cubic root of 123021403 is about 497.3478275027.

Adding to 123021403 its reverse (304120321), we get a palindrome (427141724).

The spelling of 123021403 in words is "one hundred twenty-three million, twenty-one thousand, four hundred three".