215242540000 has 240 divisors, whose sum is σ = 542339083440. Its totient is φ = 84032000000.

The previous prime is 215242539989. The next prime is 215242540013. The reversal of 215242540000 is 45242512.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 266059596 + ... + 266060404.

It is an arithmetic number, because the mean of its divisors is an integer number (2259746181).

Almost surely, 2^215242540000 is an apocalyptic number.

215242540000 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 215242540000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271169541720).

215242540000 is an abundant number, since it is smaller than the sum of its proper divisors (327096543440).

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

215242540000 is an equidigital number, since it uses as much as digits as its factorization.

215242540000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 215242540000 its reverse (45242512), we get a palindrome (215287782512).

The spelling of 215242540000 in words is "two hundred fifteen billion, two hundred forty-two million, five hundred forty thousand".