123026021 has 2 divisors, whose sum is σ = 123026022. Its totient is φ = 123026020.

The previous prime is 123026017. The next prime is 123026023. The reversal of 123026021 is 120620321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122102500 + 923521 = 11050^2 + 961^2 .

It is a cyclic number.

It is not a de Polignac number, because 123026021 - 2² = 123026017 is a prime.

Together with 123026023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123026023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61513010 + 61513011.

It is an arithmetic number, because the mean of its divisors is an integer number (61513011).

Almost surely, 2^123026021 is an apocalyptic number.

It is an amenable number.

123026021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123026021 is an equidigital number, since it uses as much as digits as its factorization.

123026021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 123026021 is about 11091.7095616501. The cubic root of 123026021 is about 497.3540506028.

Adding to 123026021 its reverse (120620321), we get a palindrome (243646342).

The spelling of 123026021 in words is "one hundred twenty-three million, twenty-six thousand, twenty-one".