20521530005200 has 90 divisors (see below), whose sum is σ = 57352441335126. Its totient is φ = 7035953137920.

The previous prime is 20521530005189. The next prime is 20521530005227. The reversal of 20521530005200 is 250003512502.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 341345725504 + 20180184279696 = 584248^2 + 4492236^2 .

It is a super-2 number, since 2×20521530005200² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 523488819 + ... + 523528018.

Almost surely, 2^{20521530005200} is an apocalyptic number.

20521530005200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20521530005200 is an abundant number, since it is smaller than the sum of its proper divisors (36830911329926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20521530005200 is a wasteful number, since it uses less digits than its factorization.

20521530005200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047016869 (or 1047016851 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

Adding to 20521530005200 its reverse (250003512502), we get a palindrome (20771533517702).

The spelling of 20521530005200 in words is "twenty trillion, five hundred twenty-one billion, five hundred thirty million, five thousand, two hundred".