21203001313 has 4 divisors (see below), whose sum is σ = 22834001428. Its totient is φ = 19572001200.

The previous prime is 21203001271. The next prime is 21203001319. The reversal of 21203001313 is 31310030212.

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 8785687824 + 12417313489 = 93732^2 + 111433^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203001313 - 2¹³ = 21202993121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203001319) 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, 815500038 + ... + 815500063.

It is an arithmetic number, because the mean of its divisors is an integer number (5708500357).

Almost surely, 2^21203001313 is an apocalyptic number.

It is an amenable number.

21203001313 is a deficient number, since it is larger than the sum of its proper divisors (1631000115).

21203001313 is a wasteful number, since it uses less digits than its factorization.

21203001313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631000114.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21203001313 its reverse (31310030212), we get a palindrome (52513031525).

The spelling of 21203001313 in words is "twenty-one billion, two hundred three million, one thousand, three hundred thirteen".