21044023369 has 2 divisors, whose sum is σ = 21044023370. Its totient is φ = 21044023368.

The previous prime is 21044023331. The next prime is 21044023381. The reversal of 21044023369 is 96332044012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20840675769 + 203347600 = 144363^2 + 14260^2 .

It is a cyclic number.

It is not a de Polignac number, because 21044023369 - 2³¹ = 18896539721 is a prime.

It is a super-2 number, since 2×21044023369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21044023669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10522011684 + 10522011685.

It is an arithmetic number, because the mean of its divisors is an integer number (10522011685).

Almost surely, 2^21044023369 is an apocalyptic number.

It is an amenable number.

21044023369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21044023369 is an equidigital number, since it uses as much as digits as its factorization.

21044023369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 34.

The spelling of 21044023369 in words is "twenty-one billion, forty-four million, twenty-three thousand, three hundred sixty-nine".