21057106328643 has 64 divisors (see below), whose sum is σ = 35363590778880. Its totient is φ = 10826578646400.

The previous prime is 21057106328627. The next prime is 21057106328647. The reversal of 21057106328643 is 34682360175012.

It is not a de Polignac number, because 21057106328643 - 2⁴ = 21057106328627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21057106328592 and 21057106328601.

It is not an unprimeable number, because it can be changed into a prime (21057106328647) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26575813 + ... + 27356681.

It is an arithmetic number, because the mean of its divisors is an integer number (552556105920).

Almost surely, 2^{21057106328643} is an apocalyptic number.

21057106328643 is a deficient number, since it is larger than the sum of its proper divisors (14306484450237).

21057106328643 is a wasteful number, since it uses less digits than its factorization.

21057106328643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782088.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 21057106328643 in words is "twenty-one trillion, fifty-seven billion, one hundred six million, three hundred twenty-eight thousand, six hundred forty-three".