21441194969 has 2 divisors, whose sum is σ = 21441194970. Its totient is φ = 21441194968.

The previous prime is 21441194953. The next prime is 21441194977. The reversal of 21441194969 is 96949114412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11970985744 + 9470209225 = 109412^2 + 97315^2 .

It is a cyclic number.

It is not a de Polignac number, because 21441194969 - 2⁴ = 21441194953 is a prime.

It is a super-2 number, since 2×21441194969² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21441194069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720597484 + 10720597485.

It is an arithmetic number, because the mean of its divisors is an integer number (10720597485).

Almost surely, 2^21441194969 is an apocalyptic number.

It is an amenable number.

21441194969 is a deficient number, since it is larger than the sum of its proper divisors (1).

21441194969 is an equidigital number, since it uses as much as digits as its factorization.

21441194969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 50.

The spelling of 21441194969 in words is "twenty-one billion, four hundred forty-one million, one hundred ninety-four thousand, nine hundred sixty-nine".