21121320015353 has 8 divisors (see below), whose sum is σ = 21393569923200. Its totient is φ = 20849192393328.

The previous prime is 21121320015317. The next prime is 21121320015391. The reversal of 21121320015353 is 35351002312112.

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 21121320015353 - 2¹⁰ = 21121320014329 is a prime.

It is a super-2 number, since 2×21121320015353² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121320015253) 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, 30223763 + ... + 30914696.

It is an arithmetic number, because the mean of its divisors is an integer number (2674196240400).

Almost surely, 2^{21121320015353} is an apocalyptic number.

It is an amenable number.

21121320015353 is a deficient number, since it is larger than the sum of its proper divisors (272249907847).

21121320015353 is an equidigital number, since it uses as much as digits as its factorization.

21121320015353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61142911.

The product of its (nonzero) digits is 5400, while the sum is 29.

Adding to 21121320015353 its reverse (35351002312112), we get a palindrome (56472322327465).

The spelling of 21121320015353 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred twenty million, fifteen thousand, three hundred fifty-three".