201382721 has 2 divisors, whose sum is σ = 201382722. Its totient is φ = 201382720.

The previous prime is 201382681. The next prime is 201382723. The reversal of 201382721 is 127283102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182547121 + 18835600 = 13511^2 + 4340^2 .

It is a cyclic number.

It is not a de Polignac number, because 201382721 - 2¹⁴ = 201366337 is a prime.

Together with 201382723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201382723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100691360 + 100691361.

It is an arithmetic number, because the mean of its divisors is an integer number (100691361).

Almost surely, 2^201382721 is an apocalyptic number.

It is an amenable number.

201382721 is a deficient number, since it is larger than the sum of its proper divisors (1).

201382721 is an equidigital number, since it uses as much as digits as its factorization.

201382721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 201382721 is about 14190.9379887307. The cubic root of 201382721 is about 586.1481539383.

The spelling of 201382721 in words is "two hundred one million, three hundred eighty-two thousand, seven hundred twenty-one".