121326013 has 4 divisors (see below), whose sum is σ = 121349340. Its totient is φ = 121302688.

The previous prime is 121325993. The next prime is 121326017. The reversal of 121326013 is 310623121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72284004 + 49042009 = 8502^2 + 7003^2 .

It is a cyclic number.

It is not a de Polignac number, because 121326013 - 2¹³ = 121317821 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 (121326017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81 + ... + 15577.

It is an arithmetic number, because the mean of its divisors is an integer number (30337335).

Almost surely, 2^121326013 is an apocalyptic number.

It is an amenable number.

121326013 is a deficient number, since it is larger than the sum of its proper divisors (23327).

121326013 is an equidigital number, since it uses as much as digits as its factorization.

121326013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23326.

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

The square root of 121326013 is about 11014.8088045140. The cubic root of 121326013 is about 495.0525577632.

Adding to 121326013 its reverse (310623121), we get a palindrome (431949134).

It can be divided in two parts, 12132 and 6013, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 121326013 in words is "one hundred twenty-one million, three hundred twenty-six thousand, thirteen".