20411521521 has 8 divisors (see below), whose sum is σ = 27848277600. Its totient is φ = 13291223232.

The previous prime is 20411521463. The next prime is 20411521531. The reversal of 20411521521 is 12512511402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20411521521 - 2¹⁰ = 20411520497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20411521491 and 20411521500.

It is not an unprimeable number, because it can be changed into a prime (20411521531) 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 7 ways as a sum of consecutive naturals, for example, 79114296 + ... + 79114553.

It is an arithmetic number, because the mean of its divisors is an integer number (3481034700).

Almost surely, 2^20411521521 is an apocalyptic number.

It is an amenable number.

20411521521 is a deficient number, since it is larger than the sum of its proper divisors (7436756079).

20411521521 is a wasteful number, since it uses less digits than its factorization.

20411521521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158228895.

The product of its (nonzero) digits is 800, while the sum is 24.

The spelling of 20411521521 in words is "twenty billion, four hundred eleven million, five hundred twenty-one thousand, five hundred twenty-one".