6721012 has 6 divisors (see below), whose sum is σ = 11761778. Its totient is φ = 3360504.

The previous prime is 6721009. The next prime is 6721019. The reversal of 6721012 is 2101276.

It can be written as a sum of positive squares in only one way, i.e., 6022116 + 698896 = 2454^2 + 836^2 .

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840123 + ... + 840130.

Almost surely, 2^6721012 is an apocalyptic number.

It is an amenable number.

6721012 is a deficient number, since it is larger than the sum of its proper divisors (5040766).

6721012 is a wasteful number, since it uses less digits than its factorization.

6721012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680257 (or 1680255 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 6721012 is about 2592.4914657526. The cubic root of 6721012 is about 188.7172315672.

Adding to 6721012 its reverse (2101276), we get a palindrome (8822288).

The spelling of 6721012 in words is "six million, seven hundred twenty-one thousand, twelve".