20244003721 has 2 divisors, whose sum is σ = 20244003722. Its totient is φ = 20244003720.

The previous prime is 20244003709. The next prime is 20244003737. The reversal of 20244003721 is 12730044202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20231079696 + 12924025 = 142236^2 + 3595^2 .

It is a cyclic number.

It is not a de Polignac number, because 20244003721 - 2²⁵ = 20210449289 is a prime.

It is not a weakly prime, because it can be changed into another prime (20244003821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122001860 + 10122001861.

It is an arithmetic number, because the mean of its divisors is an integer number (10122001861).

Almost surely, 2^20244003721 is an apocalyptic number.

It is an amenable number.

20244003721 is a deficient number, since it is larger than the sum of its proper divisors (1).

20244003721 is an equidigital number, since it uses as much as digits as its factorization.

20244003721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 25.

Adding to 20244003721 its reverse (12730044202), we get a palindrome (32974047923).

The spelling of 20244003721 in words is "twenty billion, two hundred forty-four million, three thousand, seven hundred twenty-one".