21324203351513 has 4 divisors (see below), whose sum is σ = 21341526019968. Its totient is φ = 21306880683060.

The previous prime is 21324203351509. The next prime is 21324203351557. The reversal of 21324203351513 is 31515330242312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21324203351513 - 2² = 21324203351509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21324203351573) 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, 8661332381 + ... + 8661334842.

It is an arithmetic number, because the mean of its divisors is an integer number (5335381504992).

Almost surely, 2^{21324203351513} is an apocalyptic number.

It is an amenable number.

21324203351513 is a deficient number, since it is larger than the sum of its proper divisors (17322668455).

21324203351513 is a wasteful number, since it uses less digits than its factorization.

21324203351513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17322668454.

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 21324203351513 its reverse (31515330242312), we get a palindrome (52839533593825).

The spelling of 21324203351513 in words is "twenty-one trillion, three hundred twenty-four billion, two hundred three million, three hundred fifty-one thousand, five hundred thirteen".