21440331001 has 2 divisors, whose sum is σ = 21440331002. Its totient is φ = 21440331000.

The previous prime is 21440330957. The next prime is 21440331013. The reversal of 21440331001 is 10013304412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17338568976 + 4101762025 = 131676^2 + 64045^2 .

It is a cyclic number.

It is not a de Polignac number, because 21440331001 - 2¹¹ = 21440328953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21440331001.

It is not a weakly prime, because it can be changed into another prime (21440331071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720165500 + 10720165501.

It is an arithmetic number, because the mean of its divisors is an integer number (10720165501).

Almost surely, 2^21440331001 is an apocalyptic number.

It is an amenable number.

21440331001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440331001 is an equidigital number, since it uses as much as digits as its factorization.

21440331001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21440331001 its reverse (10013304412), we get a palindrome (31453635413).

The spelling of 21440331001 in words is "twenty-one billion, four hundred forty million, three hundred thirty-one thousand, one".