215531135512 has 128 divisors (see below), whose sum is σ = 508939200000. Its totient is φ = 83127029760.

The previous prime is 215531135497. The next prime is 215531135531.

It is a happy number.

215531135512 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28173864 + ... + 28181512.

It is an arithmetic number, because the mean of its divisors is an integer number (3976087500).

Almost surely, 2^215531135512 is an apocalyptic number.

215531135512 is a gapful number since it is divisible by the number (22) 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 215531135512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254469600000).

215531135512 is an abundant number, since it is smaller than the sum of its proper divisors (293408064488).

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

215531135512 is a wasteful number, since it uses less digits than its factorization.

215531135512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8129 (or 8125 counting only the distinct ones).

The product of its digits is 22500, while the sum is 34.

The spelling of 215531135512 in words is "two hundred fifteen billion, five hundred thirty-one million, one hundred thirty-five thousand, five hundred twelve".