123103621 has 2 divisors, whose sum is σ = 123103622. Its totient is φ = 123103620.

The previous prime is 123103609. The next prime is 123103633. The reversal of 123103621 is 126301321.

It is a balanced prime because it is at equal distance from previous prime (123103609) and next prime (123103633).

It can be written as a sum of positive squares in only one way, i.e., 90041121 + 33062500 = 9489^2 + 5750^2 .

It is an emirp because it is prime and its reverse (126301321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123103621 - 2⁷ = 123103493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123103601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61551810 + 61551811.

It is an arithmetic number, because the mean of its divisors is an integer number (61551811).

Almost surely, 2^123103621 is an apocalyptic number.

It is an amenable number.

123103621 is a deficient number, since it is larger than the sum of its proper divisors (1).

123103621 is an equidigital number, since it uses as much as digits as its factorization.

123103621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 123103621 is about 11095.2071183913. The cubic root of 123103621 is about 497.4585991153.

Adding to 123103621 its reverse (126301321), we get a palindrome (249404942).

It can be divided in two parts, 12310 and 3621, that added together give a triangular number (15931 = T₁₇₈).

The spelling of 123103621 in words is "one hundred twenty-three million, one hundred three thousand, six hundred twenty-one".