215231743471 has 4 divisors (see below), whose sum is σ = 217956196000. Its totient is φ = 212507290944.

The previous prime is 215231743421. The next prime is 215231743483. The reversal of 215231743471 is 174347132512.

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

It is a cyclic number.

It is not a de Polignac number, because 215231743471 - 2⁷ = 215231743343 is a prime.

It is a super-3 number, since 3×215231743471³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215231743421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1362226146 + ... + 1362226303.

It is an arithmetic number, because the mean of its divisors is an integer number (54489049000).

Almost surely, 2^215231743471 is an apocalyptic number.

215231743471 is a deficient number, since it is larger than the sum of its proper divisors (2724452529).

215231743471 is an equidigital number, since it uses as much as digits as its factorization.

215231743471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2724452528.

The product of its digits is 141120, while the sum is 40.

Adding to 215231743471 its reverse (174347132512), we get a palindrome (389578875983).

The spelling of 215231743471 in words is "two hundred fifteen billion, two hundred thirty-one million, seven hundred forty-three thousand, four hundred seventy-one".