215652400322 has 18 divisors (see below), whose sum is σ = 331602158379. Its totient is φ = 105183158080.

The previous prime is 215652400303. The next prime is 215652400331. The reversal of 215652400322 is 223004256512.

215652400322 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 28240466401 + 187411933921 = 168049^2 + 432911^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=328369.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26922254 + ... + 26930262.

Almost surely, 2^215652400322 is an apocalyptic number.

215652400322 is a deficient number, since it is larger than the sum of its proper divisors (115949758057).

215652400322 is an frugal number, since it uses more digits than its factorization.

215652400322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16102 (or 8052 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Multiplying 215652400322 by its sum of digits (32), we get a square (6900876810304 = 2626952²).

Adding to 215652400322 its reverse (223004256512), we get a palindrome (438656656834).

The spelling of 215652400322 in words is "two hundred fifteen billion, six hundred fifty-two million, four hundred thousand, three hundred twenty-two".