215340231 has 16 divisors (see below), whose sum is σ = 292481280. Its totient is φ = 140898240.

The previous prime is 215340197. The next prime is 215340233. The reversal of 215340231 is 132043512.

It is not a de Polignac number, because 215340231 - 2¹⁰ = 215339207 is a prime.

It is a super-2 number, since 2×215340231² = 92742830174266722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215340198 and 215340207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215340233) 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, 47460 + ... + 51798.

It is an arithmetic number, because the mean of its divisors is an integer number (18280080).

Almost surely, 2^215340231 is an apocalyptic number.

215340231 is a deficient number, since it is larger than the sum of its proper divisors (77141049).

215340231 is a wasteful number, since it uses less digits than its factorization.

215340231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4646.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 215340231 is about 14674.4754931820. The cubic root of 215340231 is about 599.3884797278.

Adding to 215340231 its reverse (132043512), we get a palindrome (347383743).

The spelling of 215340231 in words is "two hundred fifteen million, three hundred forty thousand, two hundred thirty-one".