3420876721 has 4 divisors (see below), whose sum is σ = 3423507444. Its totient is φ = 3418246000.

The previous prime is 3420876707. The next prime is 3420876727. The reversal of 3420876721 is 1276780243.

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 21986721 + 3398890000 = 4689^2 + 58300^2 .

It is a cyclic number.

It is not a de Polignac number, because 3420876721 - 2⁵ = 3420876689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3420876727) 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, 1313410 + ... + 1316011.

It is an arithmetic number, because the mean of its divisors is an integer number (855876861).

Almost surely, 2^3420876721 is an apocalyptic number.

It is an amenable number.

3420876721 is a deficient number, since it is larger than the sum of its proper divisors (2630723).

3420876721 is a wasteful number, since it uses less digits than its factorization.

3420876721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2630722.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 3420876721 is about 58488.2613949158. The cubic root of 3420876721 is about 1506.7659863250.

The spelling of 3420876721 in words is "three billion, four hundred twenty million, eight hundred seventy-six thousand, seven hundred twenty-one".