21102385922 has 18 divisors (see below), whose sum is σ = 32217678729. Its totient is φ = 10366401480.

The previous prime is 21102385921. The next prime is 21102385963. The reversal of 21102385922 is 22958320112.

It can be written as a sum of positive squares in 2 ways, for example, as 11265911881 + 9836474041 = 106141^2 + 99179^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=102719.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102385921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12119972 + ... + 12121712.

Almost surely, 2^21102385922 is an apocalyptic number.

21102385922 is a deficient number, since it is larger than the sum of its proper divisors (11115292807).

21102385922 is an frugal number, since it uses more digits than its factorization.

21102385922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3602 (or 1802 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 21102385922 in words is "twenty-one billion, one hundred two million, three hundred eighty-five thousand, nine hundred twenty-two".