12240642121 has 8 divisors (see below), whose sum is σ = 12391944840. Its totient is φ = 12090048768.

The previous prime is 12240642097. The next prime is 12240642133. The reversal of 12240642121 is 12124604221.

It can be written as a sum of positive squares in 4 ways, for example, as 9388096 + 12231254025 = 3064^2 + 110595^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12240642121 - 2⁷ = 12240641993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12240142121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142576 + ... + 211681.

It is an arithmetic number, because the mean of its divisors is an integer number (1548993105).

Almost surely, 2^12240642121 is an apocalyptic number.

It is an amenable number.

12240642121 is a deficient number, since it is larger than the sum of its proper divisors (151302719).

12240642121 is a wasteful number, since it uses less digits than its factorization.

12240642121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354683.

The product of its (nonzero) digits is 1536, while the sum is 25.

The spelling of 12240642121 in words is "twelve billion, two hundred forty million, six hundred forty-two thousand, one hundred twenty-one".