215500534013 has 16 divisors (see below), whose sum is σ = 223610794800. Its totient is φ = 207436239360.

The previous prime is 215500533991. The next prime is 215500534021. The reversal of 215500534013 is 310435005512.

It can be written as a sum of positive squares in 8 ways, for example, as 107257560004 + 108242974009 = 327502^2 + 329003^2 .

It is a cyclic number.

It is not a de Polignac number, because 215500534013 - 2²⁶ = 215433425149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215500524013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21397343 + ... + 21407411.

It is an arithmetic number, because the mean of its divisors is an integer number (13975674675).

Almost surely, 2^215500534013 is an apocalyptic number.

It is an amenable number.

215500534013 is a deficient number, since it is larger than the sum of its proper divisors (8110260787).

215500534013 is a wasteful number, since it uses less digits than its factorization.

215500534013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12272.

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 215500534013 its reverse (310435005512), we get a palindrome (525935539525).

The spelling of 215500534013 in words is "two hundred fifteen billion, five hundred million, five hundred thirty-four thousand, thirteen".