215233121 has 16 divisors (see below), whose sum is σ = 232804800. Its totient is φ = 198360000.

The previous prime is 215233111. The next prime is 215233129. The reversal of 215233121 is 121332512.

It is not a de Polignac number, because 215233121 - 2¹⁰ = 215232097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215233093 and 215233102.

It is not an unprimeable number, because it can be changed into a prime (215233129) 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, 112271 + ... + 114171.

It is an arithmetic number, because the mean of its divisors is an integer number (14550300).

Almost surely, 2^215233121 is an apocalyptic number.

It is an amenable number.

215233121 is a deficient number, since it is larger than the sum of its proper divisors (17571679).

215233121 is a wasteful number, since it uses less digits than its factorization.

215233121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080.

The product of its digits is 360, while the sum is 20.

The square root of 215233121 is about 14670.8255050628. The cubic root of 215233121 is about 599.2890848506.

Adding to 215233121 its reverse (121332512), we get a palindrome (336565633).

The spelling of 215233121 in words is "two hundred fifteen million, two hundred thirty-three thousand, one hundred twenty-one".