215156022171 has 16 divisors (see below), whose sum is σ = 291214896000. Its totient is φ = 141268108608.

The previous prime is 215156022079. The next prime is 215156022181. The reversal of 215156022171 is 171220651512.

It is not a de Polignac number, because 215156022171 - 2⁷ = 215156022043 is a prime.

It is a super-2 number, since 2×215156022171² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215156022181) 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, 919935 + ... + 1129863.

It is an arithmetic number, because the mean of its divisors is an integer number (18200931000).

Almost surely, 2^215156022171 is an apocalyptic number.

215156022171 is a deficient number, since it is larger than the sum of its proper divisors (76058873829).

215156022171 is a wasteful number, since it uses less digits than its factorization.

215156022171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215098.

The product of its (nonzero) digits is 8400, while the sum is 33.

Adding to 215156022171 its reverse (171220651512), we get a palindrome (386376673683).

The spelling of 215156022171 in words is "two hundred fifteen billion, one hundred fifty-six million, twenty-two thousand, one hundred seventy-one".