6557106520021 has 8 divisors (see below), whose sum is σ = 6842299299264. Its totient is φ = 6271922173440.

The previous prime is 6557106520001. The next prime is 6557106520057. The reversal of 6557106520021 is 1200256017556.

6557106520021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6557106520021 - 2¹⁷ = 6557106388949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6557106520001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492835 + ... + 3654736.

It is an arithmetic number, because the mean of its divisors is an integer number (855287412408).

Almost surely, 2^{6557106520021} is an apocalyptic number.

It is an amenable number.

6557106520021 is a deficient number, since it is larger than the sum of its proper divisors (285192779243).

6557106520021 is a wasteful number, since it uses less digits than its factorization.

6557106520021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216331.

The product of its (nonzero) digits is 126000, while the sum is 40.

The spelling of 6557106520021 in words is "six trillion, five hundred fifty-seven billion, one hundred six million, five hundred twenty thousand, twenty-one".