21941503769 has 2 divisors, whose sum is σ = 21941503770. Its totient is φ = 21941503768.

The previous prime is 21941503741. The next prime is 21941503817. The reversal of 21941503769 is 96730514912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13753425625 + 8188078144 = 117275^2 + 90488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21941503769 is a prime.

It is a super-2 number, since 2×21941503769² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21941503709) 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, 10970751884 + 10970751885.

It is an arithmetic number, because the mean of its divisors is an integer number (10970751885).

Almost surely, 2^21941503769 is an apocalyptic number.

It is an amenable number.

21941503769 is a deficient number, since it is larger than the sum of its proper divisors (1).

21941503769 is an equidigital number, since it uses as much as digits as its factorization.

21941503769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 21941503769 in words is "twenty-one billion, nine hundred forty-one million, five hundred three thousand, seven hundred sixty-nine".