171221000200012 has 24 divisors (see below), whose sum is σ = 357330783027456. Its totient is φ = 70189975237008.

The previous prime is 171221000199979. The next prime is 171221000200013. The reversal of 171221000200012 is 210002000122171.

It is not an unprimeable number, because it can be changed into a prime (171221000200013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132935558518 + ... + 132935559805.

It is an arithmetic number, because the mean of its divisors is an integer number (14888782626144).

Almost surely, 2^{171221000200012} is an apocalyptic number.

It is an amenable number.

171221000200012 is an abundant number, since it is smaller than the sum of its proper divisors (186109782827444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171221000200012 is a wasteful number, since it uses less digits than its factorization.

171221000200012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265871118357 (or 265871118355 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 171221000200012 its reverse (210002000122171), we get a palindrome (381223000322183).

The spelling of 171221000200012 in words is "one hundred seventy-one trillion, two hundred twenty-one billion, two hundred thousand, twelve".