21351251301271 has 8 divisors (see below), whose sum is σ = 21456324627584. Its totient is φ = 21246214603320.

The previous prime is 21351251301269. The next prime is 21351251301299. The reversal of 21351251301271 is 17210315215312.

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 21351251301271 - 2¹ = 21351251301269 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 (21351251301971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7988025 + ... + 10320418.

It is an arithmetic number, because the mean of its divisors is an integer number (2682040578448).

Almost surely, 2^{21351251301271} is an apocalyptic number.

21351251301271 is a deficient number, since it is larger than the sum of its proper divisors (105073326313).

21351251301271 is a wasteful number, since it uses less digits than its factorization.

21351251301271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18314181.

The product of its (nonzero) digits is 12600, while the sum is 34.

Adding to 21351251301271 its reverse (17210315215312), we get a palindrome (38561566516583).

The spelling of 21351251301271 in words is "twenty-one trillion, three hundred fifty-one billion, two hundred fifty-one million, three hundred one thousand, two hundred seventy-one".