6707521670021 has 4 divisors (see below), whose sum is σ = 6863510546112. Its totient is φ = 6551532793932.

The previous prime is 6707521670009. The next prime is 6707521670071. The reversal of 6707521670021 is 1200761257076.

6707521670021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6707521670021 - 2¹⁸ = 6707521407877 is a prime.

It is a super-4 number, since 4×6707521670021⁴ (a number of 52 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6707521670071) 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, 77994437981 + ... + 77994438066.

It is an arithmetic number, because the mean of its divisors is an integer number (1715877636528).

Almost surely, 2^{6707521670021} is an apocalyptic number.

It is an amenable number.

6707521670021 is a deficient number, since it is larger than the sum of its proper divisors (155988876091).

6707521670021 is a wasteful number, since it uses less digits than its factorization.

6707521670021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155988876090.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 6707521670021 in words is "six trillion, seven hundred seven billion, five hundred twenty-one million, six hundred seventy thousand, twenty-one".