21057657403773 has 16 divisors (see below), whose sum is σ = 28276046134272. Its totient is φ = 13939125192000.

The previous prime is 21057657403771. The next prime is 21057657403777. The reversal of 21057657403773 is 37730475675012.

It is not a de Polignac number, because 21057657403773 - 2¹ = 21057657403771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21057657403771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33654738 + ... + 34274723.

It is an arithmetic number, because the mean of its divisors is an integer number (1767252883392).

Almost surely, 2^{21057657403773} is an apocalyptic number.

It is an amenable number.

21057657403773 is a deficient number, since it is larger than the sum of its proper divisors (7218388730499).

21057657403773 is a wasteful number, since it uses less digits than its factorization.

21057657403773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67930196.

The product of its (nonzero) digits is 25930800, while the sum is 57.

The spelling of 21057657403773 in words is "twenty-one trillion, fifty-seven billion, six hundred fifty-seven million, four hundred three thousand, seven hundred seventy-three".