126216171 has 8 divisors (see below), whose sum is σ = 186986960. Its totient is φ = 84144096.

The previous prime is 126216169. The next prime is 126216179. The reversal of 126216171 is 171612621.

It is a happy number.

126216171 is a `hidden beast` number, since 1 + 26 + 21 + 617 + 1 = 666.

It is not a de Polignac number, because 126216171 - 2¹ = 126216169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4674673 = 126216171 / (1 + 2 + 6 + 2 + 1 + 6 + 1 + 7 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126216179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2337310 + ... + 2337363.

It is an arithmetic number, because the mean of its divisors is an integer number (23373370).

Almost surely, 2^126216171 is an apocalyptic number.

126216171 is a deficient number, since it is larger than the sum of its proper divisors (60770789).

126216171 is an equidigital number, since it uses as much as digits as its factorization.

126216171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4674682 (or 4674676 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 126216171 is about 11234.5970555245. The cubic root of 126216171 is about 501.6163306535.

Adding to 126216171 its reverse (171612621), we get a palindrome (297828792).

The spelling of 126216171 in words is "one hundred twenty-six million, two hundred sixteen thousand, one hundred seventy-one".