205353520321 has 4 divisors (see below), whose sum is σ = 214281934272. Its totient is φ = 196425106372.

The previous prime is 205353520303. The next prime is 205353520349. The reversal of 205353520321 is 123025353502.

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 205353520321 - 2⁹ = 205353519809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205353520391) 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, 4464206941 + ... + 4464206986.

It is an arithmetic number, because the mean of its divisors is an integer number (53570483568).

Almost surely, 2^205353520321 is an apocalyptic number.

It is an amenable number.

205353520321 is a deficient number, since it is larger than the sum of its proper divisors (8928413951).

205353520321 is an equidigital number, since it uses as much as digits as its factorization.

205353520321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8928413950.

The product of its (nonzero) digits is 27000, while the sum is 31.

Adding to 205353520321 its reverse (123025353502), we get a palindrome (328378873823).

The spelling of 205353520321 in words is "two hundred five billion, three hundred fifty-three million, five hundred twenty thousand, three hundred twenty-one".