20135104521 has 64 divisors (see below), whose sum is σ = 35068723200. Its totient is φ = 10000843776.

The previous prime is 20135104519. The next prime is 20135104553. The reversal of 20135104521 is 12540153102.

It is a happy number.

It is not a de Polignac number, because 20135104521 - 2¹ = 20135104519 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20135104491 and 20135104500.

It is not an unprimeable number, because it can be changed into a prime (20135104501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 195840 + ... + 280398.

It is an arithmetic number, because the mean of its divisors is an integer number (547948800).

Almost surely, 2^20135104521 is an apocalyptic number.

20135104521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20135104521 is a deficient number, since it is larger than the sum of its proper divisors (14933618679).

20135104521 is a wasteful number, since it uses less digits than its factorization.

20135104521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84638.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 20135104521 its reverse (12540153102), we get a palindrome (32675257623).

The spelling of 20135104521 in words is "twenty billion, one hundred thirty-five million, one hundred four thousand, five hundred twenty-one".