21544230013 has 2 divisors, whose sum is σ = 21544230014. Its totient is φ = 21544230012.

The previous prime is 21544229977. The next prime is 21544230049. The reversal of 21544230013 is 31003244512.

It is a balanced prime because it is at equal distance from previous prime (21544229977) and next prime (21544230049).

It can be written as a sum of positive squares in only one way, i.e., 19633053924 + 1911176089 = 140118^2 + 43717^2 .

It is a cyclic number.

It is not a de Polignac number, because 21544230013 - 2¹³ = 21544221821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21544230013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21544230613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10772115006 + 10772115007.

It is an arithmetic number, because the mean of its divisors is an integer number (10772115007).

Almost surely, 2^21544230013 is an apocalyptic number.

It is an amenable number.

21544230013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21544230013 is an equidigital number, since it uses as much as digits as its factorization.

21544230013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21544230013 its reverse (31003244512), we get a palindrome (52547474525).

The spelling of 21544230013 in words is "twenty-one billion, five hundred forty-four million, two hundred thirty thousand, thirteen".