21203301313 has 4 divisors (see below), whose sum is σ = 22319264560. Its totient is φ = 20087338068.

The previous prime is 21203301307. The next prime is 21203301319. The reversal of 21203301313 is 31310330212.

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 an interprime number because it is at equal distance from previous prime (21203301307) and next prime (21203301319).

It is a cyclic number.

It is not a de Polignac number, because 21203301313 - 2⁵ = 21203301281 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1115963227 = 21203301313 / (2 + 1 + 2 + 0 + 3 + 3 + 0 + 1 + 3 + 1 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203301319) 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 3 ways as a sum of consecutive naturals, for example, 557981595 + ... + 557981632.

It is an arithmetic number, because the mean of its divisors is an integer number (5579816140).

Almost surely, 2^21203301313 is an apocalyptic number.

It is an amenable number.

21203301313 is a deficient number, since it is larger than the sum of its proper divisors (1115963247).

21203301313 is a wasteful number, since it uses less digits than its factorization.

21203301313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115963246.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21203301313 its reverse (31310330212), we get a palindrome (52513631525).

The spelling of 21203301313 in words is "twenty-one billion, two hundred three million, three hundred one thousand, three hundred thirteen".