1215350100 has 108 divisors (see below), whose sum is σ = 3912512604. Its totient is φ = 315325440.

The previous prime is 1215350099. The next prime is 1215350117. The reversal of 1215350100 is 10535121.

1215350100 is a `hidden beast` number, since 1 + 215 + 350 + 100 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 237036816 + 978313284 = 15396^2 + 31278^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15052 + ... + 51548.

Almost surely, 2^1215350100 is an apocalyptic number.

1215350100 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 1215350100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1956256302).

1215350100 is an abundant number, since it is smaller than the sum of its proper divisors (2697162504).

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

1215350100 is a wasteful number, since it uses less digits than its factorization.

1215350100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36554 (or 36544 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 1215350100 is about 34861.8717225567. The cubic root of 1215350100 is about 1067.1704727263.

Adding to 1215350100 its reverse (10535121), we get a palindrome (1225885221).

The spelling of 1215350100 in words is "one billion, two hundred fifteen million, three hundred fifty thousand, one hundred".