3421016721 has 16 divisors (see below), whose sum is σ = 5072614720. Its totient is φ = 2278679040.

The previous prime is 3421016681. The next prime is 3421016741. The reversal of 3421016721 is 1276101243.

It is not a de Polignac number, because 3421016721 - 2⁶ = 3421016657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3421016741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23815 + ... + 86076.

It is an arithmetic number, because the mean of its divisors is an integer number (317038420).

Almost surely, 2^3421016721 is an apocalyptic number.

It is an amenable number.

3421016721 is a deficient number, since it is larger than the sum of its proper divisors (1651597999).

3421016721 is a wasteful number, since it uses less digits than its factorization.

3421016721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111053 (or 111047 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 3421016721 is about 58489.4582040217. The cubic root of 3421016721 is about 1506.7865409350.

Adding to 3421016721 its reverse (1276101243), we get a palindrome (4697117964).

The spelling of 3421016721 in words is "three billion, four hundred twenty-one million, sixteen thousand, seven hundred twenty-one".