215111540000 has 960 divisors, whose sum is σ = 693785917440. Its totient is φ = 63866880000.

The previous prime is 215111539999. The next prime is 215111540009. The reversal of 215111540000 is 45111512.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (215111540009) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 3029739965 + ... + 3029740035.

It is an arithmetic number, because the mean of its divisors is an integer number (722693664).

Almost surely, 2^215111540000 is an apocalyptic number.

215111540000 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 215111540000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (346892958720).

215111540000 is an abundant number, since it is smaller than the sum of its proper divisors (478674377440).

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

215111540000 is a wasteful number, since it uses less digits than its factorization.

215111540000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

Adding to 215111540000 its reverse (45111512), we get a palindrome (215156651512).

The spelling of 215111540000 in words is "two hundred fifteen billion, one hundred eleven million, five hundred forty thousand".