21042053213 has 8 divisors (see below), whose sum is σ = 21175089600. Its totient is φ = 20909065248.

The previous prime is 21042053203. The next prime is 21042053233. The reversal of 21042053213 is 31235024012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21042053213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042053203) 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, 1310528 + ... + 1326486.

It is an arithmetic number, because the mean of its divisors is an integer number (2646886200).

Almost surely, 2^21042053213 is an apocalyptic number.

It is an amenable number.

21042053213 is a deficient number, since it is larger than the sum of its proper divisors (133036387).

21042053213 is a wasteful number, since it uses less digits than its factorization.

21042053213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24211.

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

Adding to 21042053213 its reverse (31235024012), we get a palindrome (52277077225).

The spelling of 21042053213 in words is "twenty-one billion, forty-two million, fifty-three thousand, two hundred thirteen".