213705663171 has 128 divisors (see below), whose sum is σ = 419053824000. Its totient is φ = 93121781760.

The previous prime is 213705663163. The next prime is 213705663233. The reversal of 213705663171 is 171366507312.

It is not a de Polignac number, because 213705663171 - 2³ = 213705663163 is a prime.

It is a super-3 number, since 3×213705663171³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (213705663131) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1408305 + ... + 1552653.

It is an arithmetic number, because the mean of its divisors is an integer number (3273858000).

Almost surely, 2^213705663171 is an apocalyptic number.

213705663171 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

213705663171 is a deficient number, since it is larger than the sum of its proper divisors (205348160829).

213705663171 is a wasteful number, since it uses less digits than its factorization.

213705663171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144429.

The product of its (nonzero) digits is 158760, while the sum is 42.

The spelling of 213705663171 in words is "two hundred thirteen billion, seven hundred five million, six hundred sixty-three thousand, one hundred seventy-one".