123044021 has 2 divisors, whose sum is σ = 123044022. Its totient is φ = 123044020.

The previous prime is 123043967. The next prime is 123044039. The reversal of 123044021 is 120440321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79299025 + 43744996 = 8905^2 + 6614^2 .

It is an emirp because it is prime and its reverse (120440321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123044021 - 2¹⁸ = 122781877 is a prime.

It is a super-2 number, since 2×123044021² = 30279662207696882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123044081) 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, 61522010 + 61522011.

It is an arithmetic number, because the mean of its divisors is an integer number (61522011).

Almost surely, 2^123044021 is an apocalyptic number.

It is an amenable number.

123044021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123044021 is an equidigital number, since it uses as much as digits as its factorization.

123044021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 123044021 is about 11092.5209488195. The cubic root of 123044021 is about 497.3783054617.

Adding to 123044021 its reverse (120440321), we get a palindrome (243484342).

The spelling of 123044021 in words is "one hundred twenty-three million, forty-four thousand, twenty-one".