202488420821 has 4 divisors (see below), whose sum is σ = 204575930412. Its totient is φ = 200400911232.

The previous prime is 202488420803. The next prime is 202488420829. The reversal of 202488420821 is 128024884202.

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 47792518225 + 154695902596 = 218615^2 + 393314^2 .

It is a cyclic number.

It is not a de Polignac number, because 202488420821 - 2²² = 202484226517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202488420829) 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 3 ways as a sum of consecutive naturals, for example, 1043754650 + ... + 1043754843.

It is an arithmetic number, because the mean of its divisors is an integer number (51143982603).

Almost surely, 2^202488420821 is an apocalyptic number.

It is an amenable number.

202488420821 is a deficient number, since it is larger than the sum of its proper divisors (2087509591).

202488420821 is an equidigital number, since it uses as much as digits as its factorization.

202488420821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087509590.

The product of its (nonzero) digits is 131072, while the sum is 41.

The spelling of 202488420821 in words is "two hundred two billion, four hundred eighty-eight million, four hundred twenty thousand, eight hundred twenty-one".