20303405434521 has 12 divisors (see below), whose sum is σ = 31993244927280. Its totient is φ = 12305094202680.

The previous prime is 20303405434519. The next prime is 20303405434523. The reversal of 20303405434521 is 12543450430302.

20303405434521 is a `hidden beast` number, since 2 + 0 + 30 + 3 + 40 + 543 + 45 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (20303405434519) and next prime (20303405434523).

It is not a de Polignac number, because 20303405434521 - 2¹ = 20303405434519 is a prime.

It is a super-3 number, since 3×20303405434521³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20303405434523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102542451591 + ... + 102542451788.

It is an arithmetic number, because the mean of its divisors is an integer number (2666103743940).

Almost surely, 2^{20303405434521} is an apocalyptic number.

It is an amenable number.

20303405434521 is a deficient number, since it is larger than the sum of its proper divisors (11689839492759).

20303405434521 is a wasteful number, since it uses less digits than its factorization.

20303405434521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205084903396 (or 205084903393 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

Adding to 20303405434521 its reverse (12543450430302), we get a palindrome (32846855864823).

The spelling of 20303405434521 in words is "twenty trillion, three hundred three billion, four hundred five million, four hundred thirty-four thousand, five hundred twenty-one".