123021013 has 2 divisors, whose sum is σ = 123021014. Its totient is φ = 123021012.

The previous prime is 123021011. The next prime is 123021047. The reversal of 123021013 is 310120321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62694724 + 60326289 = 7918^2 + 7767^2 .

It is a cyclic number.

It is not a de Polignac number, because 123021013 - 2¹ = 123021011 is a prime.

Together with 123021011, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 123020984 and 123021002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123021011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61510506 + 61510507.

It is an arithmetic number, because the mean of its divisors is an integer number (61510507).

Almost surely, 2^123021013 is an apocalyptic number.

It is an amenable number.

123021013 is a deficient number, since it is larger than the sum of its proper divisors (1).

123021013 is an equidigital number, since it uses as much as digits as its factorization.

123021013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 123021013 is about 11091.4838051543. The cubic root of 123021013 is about 497.3473019414.

Adding to 123021013 its reverse (310120321), we get a palindrome (433141334).

The spelling of 123021013 in words is "one hundred twenty-three million, twenty-one thousand, thirteen".