21214111113217 has 16 divisors (see below), whose sum is σ = 23237614616832. Its totient is φ = 19206538143120.

The previous prime is 21214111113203. The next prime is 21214111113227. The reversal of 21214111113217 is 71231111141212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21214111113217 - 2¹¹ = 21214111111169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21214111113227) 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, 1362358 + ... + 6654640.

It is an arithmetic number, because the mean of its divisors is an integer number (1452350913552).

Almost surely, 2^{21214111113217} is an apocalyptic number.

It is an amenable number.

21214111113217 is a deficient number, since it is larger than the sum of its proper divisors (2023503503615).

21214111113217 is a wasteful number, since it uses less digits than its factorization.

21214111113217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5293788.

The product of its digits is 672, while the sum is 28.

Adding to 21214111113217 its reverse (71231111141212), we get a palindrome (92445222254429).

The spelling of 21214111113217 in words is "twenty-one trillion, two hundred fourteen billion, one hundred eleven million, one hundred thirteen thousand, two hundred seventeen".