6721406122 has 4 divisors (see below), whose sum is σ = 10082109186. Its totient is φ = 3360703060.

The previous prime is 6721406119. The next prime is 6721406137. The reversal of 6721406122 is 2216041276.

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

It can be written as a sum of positive squares in only one way, i.e., 5597882761 + 1123523361 = 74819^2 + 33519^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1680351529 + ... + 1680351532.

Almost surely, 2^6721406122 is an apocalyptic number.

6721406122 is a deficient number, since it is larger than the sum of its proper divisors (3360703064).

6721406122 is a wasteful number, since it uses less digits than its factorization.

6721406122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3360703063.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 6721406122 is about 81984.1821450943. The cubic root of 6721406122 is about 1887.2092030525.

Adding to 6721406122 its reverse (2216041276), we get a palindrome (8937447398).

The spelling of 6721406122 in words is "six billion, seven hundred twenty-one million, four hundred six thousand, one hundred twenty-two".