21003020313 has 8 divisors (see below), whose sum is σ = 30549847776. Its totient is φ = 12729103200.

The previous prime is 21003020303. The next prime is 21003020321. The reversal of 21003020313 is 31302030012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21003020313 - 2⁵ = 21003020281 is a prime.

It is a super-2 number, since 2×21003020313² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003020292 and 21003020301.

It is not an unprimeable number, because it can be changed into a prime (21003020303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318227548 + ... + 318227613.

It is an arithmetic number, because the mean of its divisors is an integer number (3818730972).

Almost surely, 2^21003020313 is an apocalyptic number.

It is an amenable number.

21003020313 is a deficient number, since it is larger than the sum of its proper divisors (9546827463).

21003020313 is a wasteful number, since it uses less digits than its factorization.

21003020313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636455175.

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21003020313 its reverse (31302030012), we get a palindrome (52305050325).

The spelling of 21003020313 in words is "twenty-one billion, three million, twenty thousand, three hundred thirteen".