21456010313 has 6 divisors (see below), whose sum is σ = 21580780494. Its totient is φ = 21331957376.

The previous prime is 21456010309. The next prime is 21456010333. The reversal of 21456010313 is 31301065412.

It can be written as a sum of positive squares in 3 ways, for example, as 9337743424 + 12118266889 = 96632^2 + 110083^2 .

It is not a de Polignac number, because 21456010313 - 2² = 21456010309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21456010333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 328520 + ... + 388377.

It is an arithmetic number, because the mean of its divisors is an integer number (3596796749).

Almost surely, 2^21456010313 is an apocalyptic number.

It is an amenable number.

21456010313 is a deficient number, since it is larger than the sum of its proper divisors (124770181).

21456010313 is an frugal number, since it uses more digits than its factorization.

21456010313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717243 (or 717070 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21456010313 its reverse (31301065412), we get a palindrome (52757075725).

The spelling of 21456010313 in words is "twenty-one billion, four hundred fifty-six million, ten thousand, three hundred thirteen".