201521511006171 has 16 divisors (see below), whose sum is σ = 269370354132000. Its totient is φ = 134010341111808.

The previous prime is 201521511006169. The next prime is 201521511006199. The reversal of 201521511006171 is 171600115125102.

It is not a de Polignac number, because 201521511006171 - 2¹ = 201521511006169 is a prime.

It is a super-2 number, since 2×201521511006171² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201521511006131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16531816 + ... + 26006613.

It is an arithmetic number, because the mean of its divisors is an integer number (16835647133250).

Almost surely, 2^{201521511006171} is an apocalyptic number.

201521511006171 is a deficient number, since it is larger than the sum of its proper divisors (67848843125829).

201521511006171 is a wasteful number, since it uses less digits than its factorization.

201521511006171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42542398.

The product of its (nonzero) digits is 4200, while the sum is 33.

The spelling of 201521511006171 in words is "two hundred one trillion, five hundred twenty-one billion, five hundred eleven million, six thousand, one hundred seventy-one".