21005313120335 has 8 divisors (see below), whose sum is σ = 25206614869776. Its totient is φ = 16804091079360.

The previous prime is 21005313120307. The next prime is 21005313120359. The reversal of 21005313120335 is 53302131350012.

It is a happy number.

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

It is not a de Polignac number, because 21005313120335 - 2¹⁰ = 21005313119311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21005313120298 and 21005313120307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19345814 + ... + 20402723.

It is an arithmetic number, because the mean of its divisors is an integer number (3150826858722).

Almost surely, 2^{21005313120335} is an apocalyptic number.

21005313120335 is a deficient number, since it is larger than the sum of its proper divisors (4201301749441).

21005313120335 is a wasteful number, since it uses less digits than its factorization.

21005313120335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39854233.

The product of its (nonzero) digits is 8100, while the sum is 29.

Adding to 21005313120335 its reverse (53302131350012), we get a palindrome (74307444470347).

The spelling of 21005313120335 in words is "twenty-one trillion, five billion, three hundred thirteen million, one hundred twenty thousand, three hundred thirty-five".