215154323142 has 48 divisors (see below), whose sum is σ = 474019590576. Its totient is φ = 65055513600.

The previous prime is 215154323099. The next prime is 215154323149. The reversal of 215154323142 is 241323451512.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215154323149) 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 23 ways as a sum of consecutive naturals, for example, 7542 + ... + 656022.

It is an arithmetic number, because the mean of its divisors is an integer number (9875408137).

Almost surely, 2^215154323142 is an apocalyptic number.

215154323142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 215154323142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237009795288).

215154323142 is an abundant number, since it is smaller than the sum of its proper divisors (258865267434).

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

215154323142 is a wasteful number, since it uses less digits than its factorization.

215154323142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648965 (or 648954 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

Adding to 215154323142 its reverse (241323451512), we get a palindrome (456477774654).

The spelling of 215154323142 in words is "two hundred fifteen billion, one hundred fifty-four million, three hundred twenty-three thousand, one hundred forty-two".