216218903913 has 12 divisors (see below), whose sum is σ = 312324283908. Its totient is φ = 144142202400.

The previous prime is 216218903911. The next prime is 216218903939. The reversal of 216218903913 is 319309812612.

It is a happy number.

216218903913 is a `hidden beast` number, since 2 + 1 + 621 + 8 + 9 + 0 + 3 + 9 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 170810277264 + 45408626649 = 413292^2 + 213093^2 .

It is not a de Polignac number, because 216218903913 - 2¹ = 216218903911 is a prime.

It is a super-2 number, since 2×216218903913² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216218903911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81763 + ... + 662663.

It is an arithmetic number, because the mean of its divisors is an integer number (26027023659).

Almost surely, 2^216218903913 is an apocalyptic number.

It is an amenable number.

216218903913 is a deficient number, since it is larger than the sum of its proper divisors (96105379995).

216218903913 is a wasteful number, since it uses less digits than its factorization.

216218903913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622264 (or 622261 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 216218903913 in words is "two hundred sixteen billion, two hundred eighteen million, nine hundred three thousand, nine hundred thirteen".