21375172141255 has 8 divisors (see below), whose sum is σ = 25650366108624. Its totient is φ = 17100031353600.

The previous prime is 21375172141241. The next prime is 21375172141289. The reversal of 21375172141255 is 55214127157312.

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

It is not a de Polignac number, because 21375172141255 - 2⁵ = 21375172141223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12405241 + ... + 14022850.

It is an arithmetic number, because the mean of its divisors is an integer number (3206295763578).

Almost surely, 2^{21375172141255} is an apocalyptic number.

21375172141255 is a deficient number, since it is larger than the sum of its proper divisors (4275193967369).

21375172141255 is a wasteful number, since it uses less digits than its factorization.

21375172141255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26589857.

The product of its digits is 588000, while the sum is 46.

Adding to 21375172141255 its reverse (55214127157312), we get a palindrome (76589299298567).

The spelling of 21375172141255 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred seventy-two million, one hundred forty-one thousand, two hundred fifty-five".