21213202013 has 16 divisors (see below), whose sum is σ = 22264872960. Its totient is φ = 20172653424.

The previous prime is 21213202007. The next prime is 21213202027. The reversal of 21213202013 is 31020231212.

It is not a de Polignac number, because 21213202013 - 2¹⁰ = 21213200989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213201982 and 21213202000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213201013) 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 15 ways as a sum of consecutive naturals, for example, 3010148 + ... + 3017186.

It is an arithmetic number, because the mean of its divisors is an integer number (1391554560).

Almost surely, 2^21213202013 is an apocalyptic number.

21213202013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21213202013 is a deficient number, since it is larger than the sum of its proper divisors (1051670947).

21213202013 is a wasteful number, since it uses less digits than its factorization.

21213202013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7808.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21213202013 its reverse (31020231212), we get a palindrome (52233433225).

The spelling of 21213202013 in words is "twenty-one billion, two hundred thirteen million, two hundred two thousand, thirteen".