204240213330421 has 4 divisors (see below), whose sum is σ = 204240831987744. Its totient is φ = 204239594673100.

The previous prime is 204240213330383. The next prime is 204240213330481. The reversal of 204240213330421 is 124033312042402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204240213330421 - 2⁴⁵ = 169055841241589 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 (204240213330481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308833195 + ... + 309493816.

It is an arithmetic number, because the mean of its divisors is an integer number (51060207996936).

Almost surely, 2^{204240213330421} is an apocalyptic number.

It is an amenable number.

204240213330421 is a deficient number, since it is larger than the sum of its proper divisors (618657323).

204240213330421 is an equidigital number, since it uses as much as digits as its factorization.

204240213330421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618657322.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 204240213330421 its reverse (124033312042402), we get a palindrome (328273525372823).

The spelling of 204240213330421 in words is "two hundred four trillion, two hundred forty billion, two hundred thirteen million, three hundred thirty thousand, four hundred twenty-one".