20553015233213 has 4 divisors (see below), whose sum is σ = 20553721527228. Its totient is φ = 20552308939200.

The previous prime is 20553015233209. The next prime is 20553015233249. The reversal of 20553015233213 is 31233251035502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5552870741209 + 15000144492004 = 2356453^2 + 3873002^2 .

It is a cyclic number.

It is not a de Polignac number, because 20553015233213 - 2² = 20553015233209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553015233263) 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 3 ways as a sum of consecutive naturals, for example, 353103356 + ... + 353161557.

It is an arithmetic number, because the mean of its divisors is an integer number (5138430381807).

Almost surely, 2^{20553015233213} is an apocalyptic number.

It is an amenable number.

20553015233213 is a deficient number, since it is larger than the sum of its proper divisors (706294015).

20553015233213 is an equidigital number, since it uses as much as digits as its factorization.

20553015233213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706294014.

The product of its (nonzero) digits is 81000, while the sum is 35.

Adding to 20553015233213 its reverse (31233251035502), we get a palindrome (51786266268715).

The spelling of 20553015233213 in words is "twenty trillion, five hundred fifty-three billion, fifteen million, two hundred thirty-three thousand, two hundred thirteen".