21317480107251 has 8 divisors (see below), whose sum is σ = 29340187674624. Its totient is φ = 13753212972360.

The previous prime is 21317480107169. The next prime is 21317480107291. The reversal of 21317480107251 is 15270108471312.

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

It is not a de Polignac number, because 21317480107251 - 2¹⁴ = 21317480090867 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21317480107291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114610108011 + ... + 114610108196.

It is an arithmetic number, because the mean of its divisors is an integer number (3667523459328).

Almost surely, 2^{21317480107251} is an apocalyptic number.

21317480107251 is a deficient number, since it is larger than the sum of its proper divisors (8022707567373).

21317480107251 is a wasteful number, since it uses less digits than its factorization.

21317480107251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229220216241.

The product of its (nonzero) digits is 94080, while the sum is 42.

Adding to 21317480107251 its reverse (15270108471312), we get a palindrome (36587588578563).

The spelling of 21317480107251 in words is "twenty-one trillion, three hundred seventeen billion, four hundred eighty million, one hundred seven thousand, two hundred fifty-one".