201421723 has 2 divisors, whose sum is σ = 201421724. Its totient is φ = 201421722.

The previous prime is 201421699. The next prime is 201421751. The reversal of 201421723 is 327124102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201421723 - 2¹⁷ = 201290651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201421694 and 201421703.

It is not a weakly prime, because it can be changed into another prime (201421123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100710861 + 100710862.

It is an arithmetic number, because the mean of its divisors is an integer number (100710862).

Almost surely, 2^201421723 is an apocalyptic number.

201421723 is a deficient number, since it is larger than the sum of its proper divisors (1).

201421723 is an equidigital number, since it uses as much as digits as its factorization.

201421723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 201421723 is about 14192.3121090258. The cubic root of 201421723 is about 586.1859914689.

Adding to 201421723 its reverse (327124102), we get a palindrome (528545825).

The spelling of 201421723 in words is "two hundred one million, four hundred twenty-one thousand, seven hundred twenty-three".