11721454013 has 4 divisors (see below), whose sum is σ = 11722028640. Its totient is φ = 11720879388.

The previous prime is 11721454009. The next prime is 11721454037. The reversal of 11721454013 is 31045412711.

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 a cyclic number.

It is not a de Polignac number, because 11721454013 - 2² = 11721454009 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 (11721454313) 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, 255545 + ... + 297902.

It is an arithmetic number, because the mean of its divisors is an integer number (2930507160).

Almost surely, 2^11721454013 is an apocalyptic number.

It is an amenable number.

11721454013 is a deficient number, since it is larger than the sum of its proper divisors (574627).

11721454013 is an equidigital number, since it uses as much as digits as its factorization.

11721454013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574626.

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 11721454013 its reverse (31045412711), we get a palindrome (42766866724).

The spelling of 11721454013 in words is "eleven billion, seven hundred twenty-one million, four hundred fifty-four thousand, thirteen".