21144430301 has 2 divisors, whose sum is σ = 21144430302. Its totient is φ = 21144430300.

The previous prime is 21144430297. The next prime is 21144430309. The reversal of 21144430301 is 10303444112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20737440025 + 406990276 = 144005^2 + 20174^2 .

It is a cyclic number.

It is not a de Polignac number, because 21144430301 - 2² = 21144430297 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21144430309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572215150 + 10572215151.

It is an arithmetic number, because the mean of its divisors is an integer number (10572215151).

Almost surely, 2^21144430301 is an apocalyptic number.

It is an amenable number.

21144430301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144430301 is an equidigital number, since it uses as much as digits as its factorization.

21144430301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21144430301 its reverse (10303444112), we get a palindrome (31447874413).

The spelling of 21144430301 in words is "twenty-one billion, one hundred forty-four million, four hundred thirty thousand, three hundred one".