15215216112 has 120 divisors (see below), whose sum is σ = 45916175760. Its totient is φ = 4687580160.

The previous prime is 15215216101. The next prime is 15215216117. The reversal of 15215216112 is 21161251251.

It is a happy number.

15215216112 is a `hidden beast` number, since 1 + 5 + 21 + 5 + 21 + 611 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15215216117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44358 + ... + 179994.

It is an arithmetic number, because the mean of its divisors is an integer number (382634798).

Almost surely, 2^15215216112 is an apocalyptic number.

15215216112 is a gapful number since it is divisible by the number (12) 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 15215216112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22958087880).

15215216112 is an abundant number, since it is smaller than the sum of its proper divisors (30700959648).

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

15215216112 is a wasteful number, since it uses less digits than its factorization.

15215216112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135711 (or 135702 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

Adding to 15215216112 its reverse (21161251251), we get a palindrome (36376467363).

The spelling of 15215216112 in words is "fifteen billion, two hundred fifteen million, two hundred sixteen thousand, one hundred twelve".