21216363311265 has 8 divisors (see below), whose sum is σ = 33946181298048. Its totient is φ = 11315393766000.

The previous prime is 21216363311251. The next prime is 21216363311281. The reversal of 21216363311265 is 56211336361212.

It is a happy number.

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

It is not a de Polignac number, because 21216363311265 - 2¹¹ = 21216363309217 is a prime.

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, 707212110361 + ... + 707212110390.

It is an arithmetic number, because the mean of its divisors is an integer number (4243272662256).

Almost surely, 2^{21216363311265} is an apocalyptic number.

It is an amenable number.

21216363311265 is a deficient number, since it is larger than the sum of its proper divisors (12729817986783).

21216363311265 is a wasteful number, since it uses less digits than its factorization.

21216363311265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414424220759.

The product of its digits is 233280, while the sum is 42.

Adding to 21216363311265 its reverse (56211336361212), we get a palindrome (77427699672477).

The spelling of 21216363311265 in words is "twenty-one trillion, two hundred sixteen billion, three hundred sixty-three million, three hundred eleven thousand, two hundred sixty-five".