201721199 has 2 divisors, whose sum is σ = 201721200. Its totient is φ = 201721198.

The previous prime is 201721193. The next prime is 201721231. The reversal of 201721199 is 991127102.

It is an a-pointer prime, because the next prime (201721231) can be obtained adding 201721199 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201721199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201721193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100860599 + 100860600.

It is an arithmetic number, because the mean of its divisors is an integer number (100860600).

Almost surely, 2^201721199 is an apocalyptic number.

201721199 is a deficient number, since it is larger than the sum of its proper divisors (1).

201721199 is an equidigital number, since it uses as much as digits as its factorization.

201721199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 201721199 is about 14202.8588319394. The cubic root of 201721199 is about 586.4763635013.

The spelling of 201721199 in words is "two hundred one million, seven hundred twenty-one thousand, one hundred ninety-nine".