21002020313 has 8 divisors (see below), whose sum is σ = 22032233280. Its totient is φ = 19992207760.

The previous prime is 21002020301. The next prime is 21002020321. The reversal of 21002020313 is 31302020012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21002020313 - 2⁴ = 21002020297 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 (21002020343) 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 7 ways as a sum of consecutive naturals, for example, 5097995 + ... + 5102112.

It is an arithmetic number, because the mean of its divisors is an integer number (2754029160).

Almost surely, 2^21002020313 is an apocalyptic number.

It is an amenable number.

21002020313 is a deficient number, since it is larger than the sum of its proper divisors (1030212967).

21002020313 is a wasteful number, since it uses less digits than its factorization.

21002020313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10200207.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21002020313 its reverse (31302020012), we get a palindrome (52304040325).

The spelling of 21002020313 in words is "twenty-one billion, two million, twenty thousand, three hundred thirteen".