1200216171 has 16 divisors (see below), whose sum is σ = 1995164928. Its totient is φ = 623488800.

The previous prime is 1200216169. The next prime is 1200216197. The reversal of 1200216171 is 1716120021.

It is a happy number.

It is not a de Polignac number, because 1200216171 - 2¹ = 1200216169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1200216131) 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, 2597640 + ... + 2598101.

It is an arithmetic number, because the mean of its divisors is an integer number (124697808).

Almost surely, 2^1200216171 is an apocalyptic number.

1200216171 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1200216171 is a deficient number, since it is larger than the sum of its proper divisors (794948757).

1200216171 is a wasteful number, since it uses less digits than its factorization.

1200216171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5195762.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 1200216171 is about 34644.1361704979. The cubic root of 1200216171 is about 1062.7223753418.

Adding to 1200216171 its reverse (1716120021), we get a palindrome (2916336192).

The spelling of 1200216171 in words is "one billion, two hundred million, two hundred sixteen thousand, one hundred seventy-one".