144203821 has 2 divisors, whose sum is σ = 144203822. Its totient is φ = 144203820.

The previous prime is 144203797. The next prime is 144203827. The reversal of 144203821 is 128302441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142539721 + 1664100 = 11939^2 + 1290^2 .

It is a cyclic number.

It is not a de Polignac number, because 144203821 - 2⁹ = 144203309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144203827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72101910 + 72101911.

It is an arithmetic number, because the mean of its divisors is an integer number (72101911).

Almost surely, 2^144203821 is an apocalyptic number.

It is an amenable number.

144203821 is a deficient number, since it is larger than the sum of its proper divisors (1).

144203821 is an equidigital number, since it uses as much as digits as its factorization.

144203821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 144203821 is about 12008.4895386556. The cubic root of 144203821 is about 524.3954595398.

The spelling of 144203821 in words is "one hundred forty-four million, two hundred three thousand, eight hundred twenty-one".