216939379524 has 144 divisors (see below), whose sum is σ = 634041898560. Its totient is φ = 57347727360.

The previous prime is 216939379523. The next prime is 216939379603. The reversal of 216939379524 is 425973939612.

It is a super-2 number, since 2×216939379524² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216939379523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 405844 + ... + 773684.

It is an arithmetic number, because the mean of its divisors is an integer number (4403068740).

Almost surely, 2^216939379524 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216939379524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317020949280).

216939379524 is an abundant number, since it is smaller than the sum of its proper divisors (417102519036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216939379524 is a wasteful number, since it uses less digits than its factorization.

216939379524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367938 (or 367929 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 60.

The spelling of 216939379524 in words is "two hundred sixteen billion, nine hundred thirty-nine million, three hundred seventy-nine thousand, five hundred twenty-four".