21003311313 has 16 divisors (see below), whose sum is σ = 31118332800. Its totient is φ = 14001165360.

The previous prime is 21003311309. The next prime is 21003311323. The reversal of 21003311313 is 31311330012.

It is a happy number.

21003311313 is a `hidden beast` number, since 21 + 0 + 0 + 331 + 1 + 313 = 666.

It is not a de Polignac number, because 21003311313 - 2² = 21003311309 is a prime.

It is a super-2 number, since 2×21003311313² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003311323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 553803 + ... + 590511.

It is an arithmetic number, because the mean of its divisors is an integer number (1944895800).

Almost surely, 2^21003311313 is an apocalyptic number.

It is an amenable number.

21003311313 is a deficient number, since it is larger than the sum of its proper divisors (10115021487).

21003311313 is a wasteful number, since it uses less digits than its factorization.

21003311313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57909 (or 57903 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21003311313 its reverse (31311330012), we get a palindrome (52314641325).

The spelling of 21003311313 in words is "twenty-one billion, three million, three hundred eleven thousand, three hundred thirteen".