21217116214 has 16 divisors (see below), whose sum is σ = 36375696288. Its totient is φ = 9092175552.

The previous prime is 21217116211. The next prime is 21217116253. The reversal of 21217116214 is 41261171212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21217116211) 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, 90604 + ... + 225040.

It is an arithmetic number, because the mean of its divisors is an integer number (2273481018).

Almost surely, 2^21217116214 is an apocalyptic number.

21217116214 is a deficient number, since it is larger than the sum of its proper divisors (15158580074).

21217116214 is a wasteful number, since it uses less digits than its factorization.

21217116214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145719.

The product of its digits is 1344, while the sum is 28.

Adding to 21217116214 its reverse (41261171212), we get a palindrome (62478287426).

The spelling of 21217116214 in words is "twenty-one billion, two hundred seventeen million, one hundred sixteen thousand, two hundred fourteen".