20013244552721 has 8 divisors (see below), whose sum is σ = 22878293792064. Its totient is φ = 17149698889200.

The previous prime is 20013244552687. The next prime is 20013244552757. The reversal of 20013244552721 is 12725544231002.

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 20013244552721 - 2³⁴ = 19996064683537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20013244552771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375865430 + ... + 375918671.

It is an arithmetic number, because the mean of its divisors is an integer number (2859786724008).

Almost surely, 2^{20013244552721} is an apocalyptic number.

It is an amenable number.

20013244552721 is a deficient number, since it is larger than the sum of its proper divisors (2865049239343).

20013244552721 is an equidigital number, since it uses as much as digits as its factorization.

20013244552721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751787911.

The product of its (nonzero) digits is 134400, while the sum is 38.

Adding to 20013244552721 its reverse (12725544231002), we get a palindrome (32738788783723).

The spelling of 20013244552721 in words is "twenty trillion, thirteen billion, two hundred forty-four million, five hundred fifty-two thousand, seven hundred twenty-one".