21013305213 has 8 divisors (see below), whose sum is σ = 28018605888. Its totient is φ = 14008437344.

The previous prime is 21013305191. The next prime is 21013305223. The reversal of 21013305213 is 31250331012.

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 21013305213 - 2¹² = 21013301117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21013305213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013305223) 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, 30481 + ... + 207257.

It is an arithmetic number, because the mean of its divisors is an integer number (3502325736).

Almost surely, 2^21013305213 is an apocalyptic number.

It is an amenable number.

21013305213 is a deficient number, since it is larger than the sum of its proper divisors (7005300675).

21013305213 is a wasteful number, since it uses less digits than its factorization.

21013305213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216403.

The product of its (nonzero) digits is 540, while the sum is 21.

Adding to 21013305213 its reverse (31250331012), we get a palindrome (52263636225).

The spelling of 21013305213 in words is "twenty-one billion, thirteen million, three hundred five thousand, two hundred thirteen".