21304242101 has 4 divisors (see below), whose sum is σ = 21823857804. Its totient is φ = 20784626400.

The previous prime is 21304242079. The next prime is 21304242103. The reversal of 21304242101 is 10124240312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12006461476 + 9297780625 = 109574^2 + 96425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21304242101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304242103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259807790 + ... + 259807871.

It is an arithmetic number, because the mean of its divisors is an integer number (5455964451).

Almost surely, 2^21304242101 is an apocalyptic number.

It is an amenable number.

21304242101 is a deficient number, since it is larger than the sum of its proper divisors (519615703).

21304242101 is an equidigital number, since it uses as much as digits as its factorization.

21304242101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519615702.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21304242101 its reverse (10124240312), we get a palindrome (31428482413).

The spelling of 21304242101 in words is "twenty-one billion, three hundred four million, two hundred forty-two thousand, one hundred one".