201221999999999 has 4 divisors (see below), whose sum is σ = 219514909090920. Its totient is φ = 182929090909080.

The previous prime is 201221999999983. The next prime is 201222000000019. The reversal of 201221999999999 is 999999999122102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201221999999999 - 2⁴ = 201221999999983 is a prime.

It is a Duffinian number.

201221999999999 is a modest number, since divided by 99999999 gives 2012219 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221999999929) 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 3 ways as a sum of consecutive naturals, for example, 9146454545444 + ... + 9146454545465.

It is an arithmetic number, because the mean of its divisors is an integer number (54878727272730).

Almost surely, 2^{201221999999999} is an apocalyptic number.

201221999999999 is a deficient number, since it is larger than the sum of its proper divisors (18292909090921).

201221999999999 is a wasteful number, since it uses less digits than its factorization.

201221999999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18292909090920.

The product of its (nonzero) digits is 3099363912, while the sum is 89.

The spelling of 201221999999999 in words is "two hundred one trillion, two hundred twenty-one billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".