21449868941 has 2 divisors, whose sum is σ = 21449868942. Its totient is φ = 21449868940.

The previous prime is 21449868929. The next prime is 21449868953. The reversal of 21449868941 is 14986894412.

It is a balanced prime because it is at equal distance from previous prime (21449868929) and next prime (21449868953).

It can be written as a sum of positive squares in only one way, i.e., 14627934916 + 6821934025 = 120946^2 + 82595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21449868941 is a prime.

It is a super-2 number, since 2×21449868941² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21449868901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10724934470 + 10724934471.

It is an arithmetic number, because the mean of its divisors is an integer number (10724934471).

Almost surely, 2^21449868941 is an apocalyptic number.

It is an amenable number.

21449868941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21449868941 is an equidigital number, since it uses as much as digits as its factorization.

21449868941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3981312, while the sum is 56.

The spelling of 21449868941 in words is "twenty-one billion, four hundred forty-nine million, eight hundred sixty-eight thousand, nine hundred forty-one".