215142271 has 4 divisors (see below), whose sum is σ = 222561000. Its totient is φ = 207723544.

The previous prime is 215142251. The next prime is 215142313. The reversal of 215142271 is 172241512.

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 215142271 - 2¹⁹ = 214617983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215142241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3709321 + ... + 3709378.

It is an arithmetic number, because the mean of its divisors is an integer number (55640250).

Almost surely, 2^215142271 is an apocalyptic number.

215142271 is a deficient number, since it is larger than the sum of its proper divisors (7418729).

215142271 is an equidigital number, since it uses as much as digits as its factorization.

215142271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7418728.

The product of its digits is 1120, while the sum is 25.

The square root of 215142271 is about 14667.7288971401. The cubic root of 215142271 is about 599.2047529173.

Adding to 215142271 its reverse (172241512), we get a palindrome (387383783).

The spelling of 215142271 in words is "two hundred fifteen million, one hundred forty-two thousand, two hundred seventy-one".