11729921903 has 4 divisors (see below), whose sum is σ = 13405625040. Its totient is φ = 10054218768.

The previous prime is 11729921899. The next prime is 11729921923. The reversal of 11729921903 is 30912992711.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11729921903 - 2² = 11729921899 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 (11729921923) 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, 837851558 + ... + 837851571.

It is an arithmetic number, because the mean of its divisors is an integer number (3351406260).

Almost surely, 2^11729921903 is an apocalyptic number.

11729921903 is a deficient number, since it is larger than the sum of its proper divisors (1675703137).

11729921903 is an equidigital number, since it uses as much as digits as its factorization.

11729921903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675703136.

The product of its (nonzero) digits is 61236, while the sum is 44.

The spelling of 11729921903 in words is "eleven billion, seven hundred twenty-nine million, nine hundred twenty-one thousand, nine hundred three".