21202013 has 8 divisors (see below), whose sum is σ = 24367680. Its totient is φ = 18070560.

The previous prime is 21202003. The next prime is 21202033. The reversal of 21202013 is 31020212.

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 21202013 - 2⁴ = 21201997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21201985 and 21202003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7208 + ... + 9713.

It is an arithmetic number, because the mean of its divisors is an integer number (3045960).

Almost surely, 2^21202013 is an apocalyptic number.

It is an amenable number.

21202013 is a deficient number, since it is larger than the sum of its proper divisors (3165667).

21202013 is a wasteful number, since it uses less digits than its factorization.

21202013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17107.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21202013 is about 4604.5643659308. The cubic root of 21202013 is about 276.7742603408.

Adding to 21202013 its reverse (31020212), we get a palindrome (52222225).

The spelling of 21202013 in words is "twenty-one million, two hundred two thousand, thirteen".