20224521521 has 4 divisors (see below), whose sum is σ = 20410067700. Its totient is φ = 20038975344.

The previous prime is 20224521511. The next prime is 20224521523. The reversal of 20224521521 is 12512542202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10991425600 + 9233095921 = 104840^2 + 96089^2 .

It is a cyclic number.

It is not a de Polignac number, because 20224521521 - 2¹⁴ = 20224505137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20224521523) 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 3 ways as a sum of consecutive naturals, for example, 92772926 + ... + 92773143.

It is an arithmetic number, because the mean of its divisors is an integer number (5102516925).

Almost surely, 2^20224521521 is an apocalyptic number.

It is an amenable number.

20224521521 is a deficient number, since it is larger than the sum of its proper divisors (185546179).

20224521521 is a wasteful number, since it uses less digits than its factorization.

20224521521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185546178.

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 20224521521 in words is "twenty billion, two hundred twenty-four million, five hundred twenty-one thousand, five hundred twenty-one".