21355032013 has 8 divisors (see below), whose sum is σ = 24476087232. Its totient is φ = 18251560896.

The previous prime is 21355031987. The next prime is 21355032043. The reversal of 21355032013 is 31023055312.

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 21355032013 - 2⁹ = 21355031501 is a prime.

It is a super-3 number, since 3×21355032013³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355032043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4393420 + ... + 4398277.

It is an arithmetic number, because the mean of its divisors is an integer number (3059510904).

Almost surely, 2^21355032013 is an apocalyptic number.

It is an amenable number.

21355032013 is a deficient number, since it is larger than the sum of its proper divisors (3121055219).

21355032013 is an equidigital number, since it uses as much as digits as its factorization.

21355032013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8792051.

The product of its (nonzero) digits is 2700, while the sum is 25.

Adding to 21355032013 its reverse (31023055312), we get a palindrome (52378087325).

The spelling of 21355032013 in words is "twenty-one billion, three hundred fifty-five million, thirty-two thousand, thirteen".