21001302013 has 4 divisors (see below), whose sum is σ = 21047257180. Its totient is φ = 20955346848.

The previous prime is 21001301987. The next prime is 21001302017. The reversal of 21001302013 is 31020310012.

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 19302378489 + 1698923524 = 138933^2 + 41218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001302013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001301984 and 21001302002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001302017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22976898 + ... + 22977811.

It is an arithmetic number, because the mean of its divisors is an integer number (5261814295).

Almost surely, 2^21001302013 is an apocalyptic number.

It is an amenable number.

21001302013 is a deficient number, since it is larger than the sum of its proper divisors (45955167).

21001302013 is an equidigital number, since it uses as much as digits as its factorization.

21001302013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45955166.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21001302013 its reverse (31020310012), we get a palindrome (52021612025).

The spelling of 21001302013 in words is "twenty-one billion, one million, three hundred two thousand, thirteen".