3201221999 has 4 divisors (see below), whose sum is σ = 3202209336. Its totient is φ = 3200234664.

The previous prime is 3201221977. The next prime is 3201222001. The reversal of 3201221999 is 9991221023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9991221023 = 7 ⋅1427317289.

It is a cyclic number.

It is not a de Polignac number, because 3201221999 - 2¹⁶ = 3201156463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3201221909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488789 + ... + 495294.

It is an arithmetic number, because the mean of its divisors is an integer number (800552334).

Almost surely, 2^3201221999 is an apocalyptic number.

3201221999 is a deficient number, since it is larger than the sum of its proper divisors (987337).

3201221999 is an equidigital number, since it uses as much as digits as its factorization.

3201221999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987336.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 3201221999 is about 56579.3425112028. The cubic root of 3201221999 is about 1473.8001540344.

The spelling of 3201221999 in words is "three billion, two hundred one million, two hundred twenty-one thousand, nine hundred ninety-nine".