123023021 has 16 divisors (see below), whose sum is σ = 140520960. Its totient is φ = 106611120.

The previous prime is 123023011. The next prime is 123023027. The reversal of 123023021 is 120320321.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-123023021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123022987 and 123023005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123023027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95246 + ... + 96528.

It is an arithmetic number, because the mean of its divisors is an integer number (8782560).

Almost surely, 2^123023021 is an apocalyptic number.

123023021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123023021 is a deficient number, since it is larger than the sum of its proper divisors (17497939).

123023021 is a wasteful number, since it uses less digits than its factorization.

123023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 123023021 is about 11091.5743246845. The cubic root of 123023021 is about 497.3500078963.

Adding to 123023021 its reverse (120320321), we get a palindrome (243343342).

The spelling of 123023021 in words is "one hundred twenty-three million, twenty-three thousand, twenty-one".