20353033431421 has 16 divisors (see below), whose sum is σ = 21248546635440. Its totient is φ = 19475785082880.

The previous prime is 20353033431349. The next prime is 20353033431443. The reversal of 20353033431421 is 12413433035302.

It can be written as a sum of positive squares in 8 ways, for example, as 304257044025 + 20048776387396 = 551595^2 + 4477586^2 .

It is a cyclic number.

It is not a de Polignac number, because 20353033431421 - 2⁹ = 20353033430909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20353033431481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16926285 + ... + 18088813.

It is an arithmetic number, because the mean of its divisors is an integer number (1328034164715).

Almost surely, 2^{20353033431421} is an apocalyptic number.

It is an amenable number.

20353033431421 is a deficient number, since it is larger than the sum of its proper divisors (895513204019).

20353033431421 is a wasteful number, since it uses less digits than its factorization.

20353033431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170384.

The product of its (nonzero) digits is 77760, while the sum is 34.

Adding to 20353033431421 its reverse (12413433035302), we get a palindrome (32766466466723).

The spelling of 20353033431421 in words is "twenty trillion, three hundred fifty-three billion, thirty-three million, four hundred thirty-one thousand, four hundred twenty-one".