11721604403 has 16 divisors (see below), whose sum is σ = 12091972704. Its totient is φ = 11354204160.

The previous prime is 11721604331. The next prime is 11721604409. The reversal of 11721604403 is 30440612711.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11721604403 - 2¹² = 11721600307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11721604409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14452868 + ... + 14453678.

It is an arithmetic number, because the mean of its divisors is an integer number (755748294).

Almost surely, 2^11721604403 is an apocalyptic number.

11721604403 is a deficient number, since it is larger than the sum of its proper divisors (370368301).

11721604403 is an equidigital number, since it uses as much as digits as its factorization.

11721604403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102.

The product of its (nonzero) digits is 4032, while the sum is 29.

The spelling of 11721604403 in words is "eleven billion, seven hundred twenty-one million, six hundred four thousand, four hundred three".