20421324299 has 2 divisors, whose sum is σ = 20421324300. Its totient is φ = 20421324298.

The previous prime is 20421324289. The next prime is 20421324311. The reversal of 20421324299 is 99242312402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20421324299 - 2⁸ = 20421324043 is a prime.

It is a super-2 number, since 2×20421324299² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20421324289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210662149 + 10210662150.

It is an arithmetic number, because the mean of its divisors is an integer number (10210662150).

Almost surely, 2^20421324299 is an apocalyptic number.

20421324299 is a deficient number, since it is larger than the sum of its proper divisors (1).

20421324299 is an equidigital number, since it uses as much as digits as its factorization.

20421324299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 20421324299 in words is "twenty billion, four hundred twenty-one million, three hundred twenty-four thousand, two hundred ninety-nine".