2191721703 has 8 divisors (see below), whose sum is σ = 2937437808. Its totient is φ = 1453576704.

The previous prime is 2191721699. The next prime is 2191721711. The reversal of 2191721703 is 3071271912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2191721703 - 2² = 2191721699 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191721783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1892100 + ... + 1893257.

It is an arithmetic number, because the mean of its divisors is an integer number (367179726).

Almost surely, 2^2191721703 is an apocalyptic number.

2191721703 is a deficient number, since it is larger than the sum of its proper divisors (745716105).

2191721703 is a wasteful number, since it uses less digits than its factorization.

2191721703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785553.

The product of its (nonzero) digits is 5292, while the sum is 33.

The square root of 2191721703 is about 46815.8274838756. The cubic root of 2191721703 is about 1298.9580809288.

The spelling of 2191721703 in words is "two billion, one hundred ninety-one million, seven hundred twenty-one thousand, seven hundred three".