20012050521 has 12 divisors (see below), whose sum is σ = 28954400020. Its totient is φ = 13319164800.

The previous prime is 20012050517. The next prime is 20012050537. The reversal of 20012050521 is 12505021002.

20012050521 is a `hidden beast` number, since 20 + 0 + 120 + 5 + 0 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10218177225 + 9793873296 = 101085^2 + 98964^2 .

It is not a de Polignac number, because 20012050521 - 2² = 20012050517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012050494 and 20012050503.

It is not an unprimeable number, because it can be changed into a prime (20012050501) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1844476 + ... + 1855293.

Almost surely, 2^20012050521 is an apocalyptic number.

It is an amenable number.

20012050521 is a deficient number, since it is larger than the sum of its proper divisors (8942349499).

20012050521 is a wasteful number, since it uses less digits than its factorization.

20012050521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700376 (or 3700373 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

Adding to 20012050521 its reverse (12505021002), we get a palindrome (32517071523).

The spelling of 20012050521 in words is "twenty billion, twelve million, fifty thousand, five hundred twenty-one".