123245021 has 2 divisors, whose sum is σ = 123245022. Its totient is φ = 123245020.

The previous prime is 123245011. The next prime is 123245033. The reversal of 123245021 is 120542321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121771225 + 1473796 = 11035^2 + 1214^2 .

It is an emirp because it is prime and its reverse (120542321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123245021 - 2²² = 119050717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123244984 and 123245002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123245011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61622510 + 61622511.

It is an arithmetic number, because the mean of its divisors is an integer number (61622511).

Almost surely, 2^123245021 is an apocalyptic number.

It is an amenable number.

123245021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123245021 is an equidigital number, since it uses as much as digits as its factorization.

123245021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 123245021 is about 11101.5774104404. The cubic root of 123245021 is about 497.6489908380.

Adding to 123245021 its reverse (120542321), we get a palindrome (243787342).

The spelling of 123245021 in words is "one hundred twenty-three million, two hundred forty-five thousand, twenty-one".