215556304344252 has 24 divisors (see below), whose sum is σ = 502967065741056. Its totient is φ = 71851764933168.

The previous prime is 215556304344229. The next prime is 215556304344253. The reversal of 215556304344252 is 252443403655512.

It is a junction number, because it is equal to n+sod(n) for n = 215556304344195 and 215556304344204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215556304344253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39388578 + ... + 44526089.

It is an arithmetic number, because the mean of its divisors is an integer number (20956961072544).

Almost surely, 2^{215556304344252} is an apocalyptic number.

It is an amenable number.

215556304344252 is an abundant number, since it is smaller than the sum of its proper divisors (287410761396804).

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

215556304344252 is a wasteful number, since it uses less digits than its factorization.

215556304344252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84128737 (or 84128735 counting only the distinct ones).

The product of its (nonzero) digits is 17280000, while the sum is 51.

Adding to 215556304344252 its reverse (252443403655512), we get a palindrome (467999707999764).

The spelling of 215556304344252 in words is "two hundred fifteen trillion, five hundred fifty-six billion, three hundred four million, three hundred forty-four thousand, two hundred fifty-two".