201215506171 has 4 divisors (see below), whose sum is σ = 202548059344. Its totient is φ = 199882953000.

The previous prime is 201215506169. The next prime is 201215506189. The reversal of 201215506171 is 171605512102.

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 201215506171 - 2¹ = 201215506169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201215506771) 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, 666276360 + ... + 666276661.

It is an arithmetic number, because the mean of its divisors is an integer number (50637014836).

Almost surely, 2^201215506171 is an apocalyptic number.

201215506171 is a deficient number, since it is larger than the sum of its proper divisors (1332553173).

201215506171 is a wasteful number, since it uses less digits than its factorization.

201215506171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332553172.

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 201215506171 in words is "two hundred one billion, two hundred fifteen million, five hundred six thousand, one hundred seventy-one".