21234205013 has 8 divisors (see below), whose sum is σ = 24269741760. Its totient is φ = 18199188000.

The previous prime is 21234205001. The next prime is 21234205037. The reversal of 21234205013 is 31050243212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21234205013 - 2²⁰ = 21233156437 is a prime.

It is a super-2 number, since 2×21234205013² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21234205013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234205063) 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, 38048 + ... + 209561.

It is an arithmetic number, because the mean of its divisors is an integer number (3033717720).

Almost surely, 2^21234205013 is an apocalyptic number.

It is an amenable number.

21234205013 is a deficient number, since it is larger than the sum of its proper divisors (3035536747).

21234205013 is a wasteful number, since it uses less digits than its factorization.

21234205013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259867.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21234205013 its reverse (31050243212), we get a palindrome (52284448225).

The spelling of 21234205013 in words is "twenty-one billion, two hundred thirty-four million, two hundred five thousand, thirteen".