21898744101 has 36 divisors (see below), whose sum is σ = 35952024108. Its totient is φ = 12766854528.

The previous prime is 21898744093. The next prime is 21898744159. The reversal of 21898744101 is 10144789812.

It can be written as a sum of positive squares in 2 ways, for example, as 8244821601 + 13653922500 = 90801^2 + 116850^2 .

It is not a de Polignac number, because 21898744101 - 2³ = 21898744093 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21898744171) 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 in 35 ways as a sum of consecutive naturals, for example, 217000 + ... + 301473.

Almost surely, 2^21898744101 is an apocalyptic number.

It is an amenable number.

21898744101 is a deficient number, since it is larger than the sum of its proper divisors (14053280007).

21898744101 is a wasteful number, since it uses less digits than its factorization.

21898744101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518530 (or 518508 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 21898744101 in words is "twenty-one billion, eight hundred ninety-eight million, seven hundred forty-four thousand, one hundred one".