21375172141257 has 48 divisors (see below), whose sum is σ = 31654751098880. Its totient is φ = 12819179149920.

The previous prime is 21375172141241. The next prime is 21375172141289. The reversal of 21375172141257 is 75214127157312.

It is not a de Polignac number, because 21375172141257 - 2⁴ = 21375172141241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21375172141457) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49399794 + ... + 49830612.

Almost surely, 2^{21375172141257} is an apocalyptic number.

It is an amenable number.

21375172141257 is a deficient number, since it is larger than the sum of its proper divisors (10279578957623).

21375172141257 is a wasteful number, since it uses less digits than its factorization.

21375172141257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432274 (or 432263 counting only the distinct ones).

The product of its digits is 823200, while the sum is 48.

Adding to 21375172141257 its reverse (75214127157312), we get a palindrome (96589299298569).

The spelling of 21375172141257 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred seventy-two million, one hundred forty-one thousand, two hundred fifty-seven".