201321999 has 6 divisors (see below), whose sum is σ = 290798456. Its totient is φ = 134214660.

The previous prime is 201321997. The next prime is 201322039. The reversal of 201321999 is 999123102.

It is a happy number.

It is not a de Polignac number, because 201321999 - 2¹ = 201321997 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 (201321997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11184547 + ... + 11184564.

Almost surely, 2^201321999 is an apocalyptic number.

201321999 is a deficient number, since it is larger than the sum of its proper divisors (89476457).

201321999 is a wasteful number, since it uses less digits than its factorization.

201321999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22369117 (or 22369114 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 201321999 is about 14188.7983634979. The cubic root of 201321999 is about 586.0892351692.

The spelling of 201321999 in words is "two hundred one million, three hundred twenty-one thousand, nine hundred ninety-nine".