123621013 has 4 divisors (see below), whose sum is σ = 123825280. Its totient is φ = 123416748.

The previous prime is 123621007. The next prime is 123621019. The reversal of 123621013 is 310126321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (123621007) and next prime (123621019).

It is a cyclic number.

It is not a de Polignac number, because 123621013 - 2¹³ = 123612821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123621019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101223 + ... + 102436.

It is an arithmetic number, because the mean of its divisors is an integer number (30956320).

Almost surely, 2^123621013 is an apocalyptic number.

It is an amenable number.

123621013 is a deficient number, since it is larger than the sum of its proper divisors (204267).

123621013 is an equidigital number, since it uses as much as digits as its factorization.

123621013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204266.

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

The square root of 123621013 is about 11118.4986846246. The cubic root of 123621013 is about 498.1545476580.

Adding to 123621013 its reverse (310126321), we get a palindrome (433747334).

The spelling of 123621013 in words is "one hundred twenty-three million, six hundred twenty-one thousand, thirteen".