215231524040 has 128 divisors (see below), whose sum is σ = 542402784000. Its totient is φ = 76348984320.

The previous prime is 215231524019. The next prime is 215231524043. The reversal of 215231524040 is 40425132512.

It is a super-3 number, since 3×215231524040³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215231523994 and 215231524012.

It is not an unprimeable number, because it can be changed into a prime (215231524043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1285061 + ... + 1442859.

It is an arithmetic number, because the mean of its divisors is an integer number (4237521750).

Almost surely, 2^215231524040 is an apocalyptic number.

215231524040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215231524040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271201392000).

215231524040 is an abundant number, since it is smaller than the sum of its proper divisors (327171259960).

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

215231524040 is a wasteful number, since it uses less digits than its factorization.

215231524040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157927 (or 157923 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 215231524040 its reverse (40425132512), we get a palindrome (255656656552).

The spelling of 215231524040 in words is "two hundred fifteen billion, two hundred thirty-one million, five hundred twenty-four thousand, forty".