21601631217315 has 16 divisors (see below), whose sum is σ = 34563524895648. Its totient is φ = 11520564999936.

The previous prime is 21601631217293. The next prime is 21601631217319. The reversal of 21601631217315 is 51371213610612.

It is not a de Polignac number, because 21601631217315 - 2¹⁴ = 21601631200931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21601631217319) 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, 18475314 + ... + 19609703.

It is an arithmetic number, because the mean of its divisors is an integer number (2160220305978).

Almost surely, 2^{21601631217315} is an apocalyptic number.

21601631217315 is a deficient number, since it is larger than the sum of its proper divisors (12961893678333).

21601631217315 is a wasteful number, since it uses less digits than its factorization.

21601631217315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38122838.

The product of its (nonzero) digits is 45360, while the sum is 39.

Adding to 21601631217315 its reverse (51371213610612), we get a palindrome (72972844827927).

The spelling of 21601631217315 in words is "twenty-one trillion, six hundred one billion, six hundred thirty-one million, two hundred seventeen thousand, three hundred fifteen".