11726487554021 has 4 divisors (see below), whose sum is σ = 11726497641600. Its totient is φ = 11726477466444.

The previous prime is 11726487553931. The next prime is 11726487554039. The reversal of 11726487554021 is 12045578462711.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11726487554021 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 (11726487554081) 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, 3032831 + ... + 5714108.

It is an arithmetic number, because the mean of its divisors is an integer number (2931624410400).

Almost surely, 2^{11726487554021} is an apocalyptic number.

It is an amenable number.

11726487554021 is a deficient number, since it is larger than the sum of its proper divisors (10087579).

11726487554021 is an equidigital number, since it uses as much as digits as its factorization.

11726487554021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10087578.

The product of its (nonzero) digits is 3763200, while the sum is 53.

The spelling of 11726487554021 in words is "eleven trillion, seven hundred twenty-six billion, four hundred eighty-seven million, five hundred fifty-four thousand, twenty-one".