215420231 has 16 divisors (see below), whose sum is σ = 243397056. Its totient is φ = 189167616.

The previous prime is 215420213. The next prime is 215420237. The reversal of 215420231 is 132024512.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215420231 is a prime.

It is a super-2 number, since 2×215420231² = 92811751848186722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215420237) 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, 55841 + ... + 59573.

It is an arithmetic number, because the mean of its divisors is an integer number (15212316).

Almost surely, 2^215420231 is an apocalyptic number.

215420231 is a deficient number, since it is larger than the sum of its proper divisors (27976825).

215420231 is a wasteful number, since it uses less digits than its factorization.

215420231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3962.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 215420231 is about 14677.2010615103. The cubic root of 215420231 is about 599.4626958359.

Adding to 215420231 its reverse (132024512), we get a palindrome (347444743).

The spelling of 215420231 in words is "two hundred fifteen million, four hundred twenty thousand, two hundred thirty-one".