21244024073 has 2 divisors, whose sum is σ = 21244024074. Its totient is φ = 21244024072.

The previous prime is 21244024057. The next prime is 21244024103. The reversal of 21244024073 is 37042044212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12582557584 + 8661466489 = 112172^2 + 93067^2 .

It is a cyclic number.

It is not a de Polignac number, because 21244024073 - 2⁴ = 21244024057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21244024573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622012036 + 10622012037.

It is an arithmetic number, because the mean of its divisors is an integer number (10622012037).

Almost surely, 2^21244024073 is an apocalyptic number.

It is an amenable number.

21244024073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21244024073 is an equidigital number, since it uses as much as digits as its factorization.

21244024073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 29.

Adding to 21244024073 its reverse (37042044212), we get a palindrome (58286068285).

The spelling of 21244024073 in words is "twenty-one billion, two hundred forty-four million, twenty-four thousand, seventy-three".