3347391721 has 4 divisors (see below), whose sum is σ = 3381901012. Its totient is φ = 3312882432.

The previous prime is 3347391703. The next prime is 3347391769. The reversal of 3347391721 is 1271937433.

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

It can be written as a sum of positive squares in 2 ways, for example, as 741799696 + 2605592025 = 27236^2 + 51045^2 .

It is a cyclic number.

It is not a de Polignac number, because 3347391721 - 2²³ = 3339003113 is a prime.

It is a super-2 number, since 2×3347391721² = 22410062667638683682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3347391791) 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, 17254500 + ... + 17254693.

It is an arithmetic number, because the mean of its divisors is an integer number (845475253).

Almost surely, 2^3347391721 is an apocalyptic number.

It is an amenable number.

3347391721 is a deficient number, since it is larger than the sum of its proper divisors (34509291).

3347391721 is an equidigital number, since it uses as much as digits as its factorization.

3347391721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34509290.

The product of its digits is 95256, while the sum is 40.

The square root of 3347391721 is about 57856.6480276900. The cubic root of 3347391721 is about 1495.8986809342.

The spelling of 3347391721 in words is "three billion, three hundred forty-seven million, three hundred ninety-one thousand, seven hundred twenty-one".