102015215500 has 96 divisors (see below), whose sum is σ = 248227918848. Its totient is φ = 36307064000.

The previous prime is 102015215461. The next prime is 102015215513. The reversal of 102015215500 is 5512510201.

It is a happy number.

It is a super-2 number, since 2×102015215500² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 31 ways as a sum of consecutive naturals, for example, 61179 + ... + 455821.

It is an arithmetic number, because the mean of its divisors is an integer number (2585707488).

Almost surely, 2^102015215500 is an apocalyptic number.

102015215500 is a gapful number since it is divisible by the number (10) 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 102015215500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124113959424).

102015215500 is an abundant number, since it is smaller than the sum of its proper divisors (146212703348).

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

102015215500 is a wasteful number, since it uses less digits than its factorization.

102015215500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394720 (or 394708 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

Adding to 102015215500 its reverse (5512510201), we get a palindrome (107527725701).

The spelling of 102015215500 in words is "one hundred two billion, fifteen million, two hundred fifteen thousand, five hundred".