21803624377 has 2 divisors, whose sum is σ = 21803624378. Its totient is φ = 21803624376.

The previous prime is 21803624357. The next prime is 21803624383. The reversal of 21803624377 is 77342630812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21523530681 + 280093696 = 146709^2 + 16736^2 .

It is a cyclic number.

It is not a de Polignac number, because 21803624377 - 2¹¹ = 21803622329 is a prime.

It is not a weakly prime, because it can be changed into another prime (21803624317) 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, 10901812188 + 10901812189.

It is an arithmetic number, because the mean of its divisors is an integer number (10901812189).

Almost surely, 2^21803624377 is an apocalyptic number.

It is an amenable number.

21803624377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21803624377 is an equidigital number, since it uses as much as digits as its factorization.

21803624377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 43.

The spelling of 21803624377 in words is "twenty-one billion, eight hundred three million, six hundred twenty-four thousand, three hundred seventy-seven".