20533505421 has 16 divisors (see below), whose sum is σ = 32164372800. Its totient is φ = 11487275520.

The previous prime is 20533505401. The next prime is 20533505441. The reversal of 20533505421 is 12450533502.

It is an interprime number because it is at equal distance from previous prime (20533505401) and next prime (20533505441).

It is not a de Polignac number, because 20533505421 - 2¹¹ = 20533503373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533505401) 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 15 ways as a sum of consecutive naturals, for example, 23931396 + ... + 23932253.

It is an arithmetic number, because the mean of its divisors is an integer number (2010273300).

Almost surely, 2^20533505421 is an apocalyptic number.

It is an amenable number.

20533505421 is a deficient number, since it is larger than the sum of its proper divisors (11630867379).

20533505421 is a wasteful number, since it uses less digits than its factorization.

20533505421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47863676.

The product of its (nonzero) digits is 18000, while the sum is 30.

The spelling of 20533505421 in words is "twenty billion, five hundred thirty-three million, five hundred five thousand, four hundred twenty-one".