2191721702 has 16 divisors (see below), whose sum is σ = 3483453600. Its totient is φ = 1030662528.

The previous prime is 2191721699. The next prime is 2191721711. The reversal of 2191721702 is 2071271912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26924 + ... + 71472.

It is an arithmetic number, because the mean of its divisors is an integer number (217715850).

Almost surely, 2^2191721702 is an apocalyptic number.

2191721702 is a deficient number, since it is larger than the sum of its proper divisors (1291731898).

2191721702 is a wasteful number, since it uses less digits than its factorization.

2191721702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46015.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 2191721702 is about 46815.8274731954. The cubic root of 2191721702 is about 1298.9580807313.

The spelling of 2191721702 in words is "two billion, one hundred ninety-one million, seven hundred twenty-one thousand, seven hundred two".