215171121 has 16 divisors (see below), whose sum is σ = 313371648. Its totient is φ = 130242000.

The previous prime is 215171119. The next prime is 215171129. The reversal of 215171121 is 121171512.

It is not a de Polignac number, because 215171121 - 2¹ = 215171119 is a prime.

It is a super-2 number, since 2×215171121² = 92597222624793282, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215171129) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 25596 + ... + 32946.

It is an arithmetic number, because the mean of its divisors is an integer number (19585728).

Almost surely, 2^215171121 is an apocalyptic number.

It is an amenable number.

215171121 is a deficient number, since it is larger than the sum of its proper divisors (98200527).

215171121 is a wasteful number, since it uses less digits than its factorization.

215171121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8252.

The product of its digits is 140, while the sum is 21.

The square root of 215171121 is about 14668.7123156738. The cubic root of 215171121 is about 599.2315356355.

The spelling of 215171121 in words is "two hundred fifteen million, one hundred seventy-one thousand, one hundred twenty-one".