21144010313 has 4 divisors (see below), whose sum is σ = 21191102100. Its totient is φ = 21096918528.

The previous prime is 21144010297. The next prime is 21144010399. The reversal of 21144010313 is 31301044112.

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 17788357129 + 3355653184 = 133373^2 + 57928^2 .

It is a cyclic number.

It is not a de Polignac number, because 21144010313 - 2⁴ = 21144010297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21144019313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23545220 + ... + 23546117.

It is an arithmetic number, because the mean of its divisors is an integer number (5297775525).

Almost surely, 2^21144010313 is an apocalyptic number.

It is an amenable number.

21144010313 is a deficient number, since it is larger than the sum of its proper divisors (47091787).

21144010313 is an equidigital number, since it uses as much as digits as its factorization.

21144010313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47091786.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21144010313 its reverse (31301044112), we get a palindrome (52445054425).

The spelling of 21144010313 in words is "twenty-one billion, one hundred forty-four million, ten thousand, three hundred thirteen".