20424221449 has 2 divisors, whose sum is σ = 20424221450. Its totient is φ = 20424221448.

The previous prime is 20424221423. The next prime is 20424221453. The reversal of 20424221449 is 94412242402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18596231424 + 1827990025 = 136368^2 + 42755^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424221449 - 2⁵ = 20424221417 is a prime.

It is not a weakly prime, because it can be changed into another prime (20424221459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212110724 + 10212110725.

It is an arithmetic number, because the mean of its divisors is an integer number (10212110725).

Almost surely, 2^20424221449 is an apocalyptic number.

It is an amenable number.

20424221449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424221449 is an equidigital number, since it uses as much as digits as its factorization.

20424221449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 34.

The spelling of 20424221449 in words is "twenty billion, four hundred twenty-four million, two hundred twenty-one thousand, four hundred forty-nine".