21002332013 has 8 divisors (see below), whose sum is σ = 22637945400. Its totient is φ = 19369582848.

The previous prime is 21002331983. The next prime is 21002332031. The reversal of 21002332013 is 31023320012.

It can be written as a sum of positive squares in 4 ways, for example, as 248472169 + 20753859844 = 15763^2 + 144062^2 .

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 21002332013 - 2²⁰ = 21001283437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002331982 and 21002332000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002332913) 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, 700808 + ... + 730161.

It is an arithmetic number, because the mean of its divisors is an integer number (2829743175).

Almost surely, 2^21002332013 is an apocalyptic number.

It is an amenable number.

21002332013 is a deficient number, since it is larger than the sum of its proper divisors (1635613387).

21002332013 is a wasteful number, since it uses less digits than its factorization.

21002332013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432111.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21002332013 its reverse (31023320012), we get a palindrome (52025652025).

The spelling of 21002332013 in words is "twenty-one billion, two million, three hundred thirty-two thousand, thirteen".