11648437121 has 4 divisors (see below), whose sum is σ = 11649860544. Its totient is φ = 11647013700.

The previous prime is 11648437091. The next prime is 11648437133. The reversal of 11648437121 is 12173484611.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12173484611 = 149 ⋅81701239.

It is a cyclic number.

It is not a de Polignac number, because 11648437121 - 2⁶ = 11648437057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11648467121) 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, 699365 + ... + 715826.

It is an arithmetic number, because the mean of its divisors is an integer number (2912465136).

Almost surely, 2^11648437121 is an apocalyptic number.

It is an amenable number.

11648437121 is a deficient number, since it is larger than the sum of its proper divisors (1423423).

11648437121 is an equidigital number, since it uses as much as digits as its factorization.

11648437121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423422.

The product of its digits is 32256, while the sum is 38.

The spelling of 11648437121 in words is "eleven billion, six hundred forty-eight million, four hundred thirty-seven thousand, one hundred twenty-one".