215142227 has 4 divisors (see below), whose sum is σ = 215178936. Its totient is φ = 215105520.

The previous prime is 215142173. The next prime is 215142241. The reversal of 215142227 is 722241512.

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 215142227 - 2⁶ = 215142163 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215142196 and 215142205.

It is not an unprimeable number, because it can be changed into a prime (215142247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7373 + ... + 22014.

It is an arithmetic number, because the mean of its divisors is an integer number (53794734).

Almost surely, 2^215142227 is an apocalyptic number.

215142227 is a deficient number, since it is larger than the sum of its proper divisors (36709).

215142227 is an equidigital number, since it uses as much as digits as its factorization.

215142227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36708.

The product of its digits is 2240, while the sum is 26.

The square root of 215142227 is about 14667.7273972487. The cubic root of 215142227 is about 599.2047120683.

Adding to 215142227 its reverse (722241512), we get a palindrome (937383739).

The spelling of 215142227 in words is "two hundred fifteen million, one hundred forty-two thousand, two hundred twenty-seven".