6721970329 has 4 divisors (see below), whose sum is σ = 6722417920. Its totient is φ = 6721522740.

The previous prime is 6721970303. The next prime is 6721970341. The reversal of 6721970329 is 9230791276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6721970329 - 2⁷ = 6721970201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6721970029) 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, 200457 + ... + 231574.

It is an arithmetic number, because the mean of its divisors is an integer number (1680604480).

Almost surely, 2^6721970329 is an apocalyptic number.

It is an amenable number.

6721970329 is a deficient number, since it is larger than the sum of its proper divisors (447591).

6721970329 is a wasteful number, since it uses less digits than its factorization.

6721970329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447590.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 6721970329 is about 81987.6230232344. The cubic root of 6721970329 is about 1887.2620068276.

The spelling of 6721970329 in words is "six billion, seven hundred twenty-one million, nine hundred seventy thousand, three hundred twenty-nine".