215556122 has 4 divisors (see below), whose sum is σ = 323334186. Its totient is φ = 107778060.

The previous prime is 215556109. The next prime is 215556149. The reversal of 215556122 is 221655512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 154231561 + 61324561 = 12419^2 + 7831^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53889029 + ... + 53889032.

Almost surely, 2^215556122 is an apocalyptic number.

215556122 is a deficient number, since it is larger than the sum of its proper divisors (107778064).

215556122 is a wasteful number, since it uses less digits than its factorization.

215556122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107778063.

The product of its digits is 6000, while the sum is 29.

The square root of 215556122 is about 14681.8296543721. The cubic root of 215556122 is about 599.5887199975.

The spelling of 215556122 in words is "two hundred fifteen million, five hundred fifty-six thousand, one hundred twenty-two".