121215013 has 4 divisors (see below), whose sum is σ = 121288140. Its totient is φ = 121141888.

The previous prime is 121215007. The next prime is 121215019. The reversal of 121215013 is 310512121.

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

It is an interprime number because it is at equal distance from previous prime (121215007) and next prime (121215019).

It can be written as a sum of positive squares in 2 ways, for example, as 57486724 + 63728289 = 7582^2 + 7983^2 .

It is a cyclic number.

It is not a de Polignac number, because 121215013 - 2²⁵ = 87660581 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 (121215019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34018 + ... + 37411.

It is an arithmetic number, because the mean of its divisors is an integer number (30322035).

Almost surely, 2^121215013 is an apocalyptic number.

It is an amenable number.

121215013 is a deficient number, since it is larger than the sum of its proper divisors (73127).

121215013 is an equidigital number, since it uses as much as digits as its factorization.

121215013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73126.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 121215013 is about 11009.7689803193. The cubic root of 121215013 is about 494.9015387606.

Adding to 121215013 its reverse (310512121), we get a palindrome (431727134).

The spelling of 121215013 in words is "one hundred twenty-one million, two hundred fifteen thousand, thirteen".