205205534121 has 8 divisors (see below), whose sum is σ = 312694147264. Its totient is φ = 117260305200.

The previous prime is 205205534101. The next prime is 205205534123. The reversal of 205205534121 is 121435502502.

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

It is not a de Polignac number, because 205205534121 - 2⁹ = 205205533609 is a prime.

It is a super-2 number, since 2×205205534121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205205534123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4885846030 + ... + 4885846071.

It is an arithmetic number, because the mean of its divisors is an integer number (39086768408).

Almost surely, 2^205205534121 is an apocalyptic number.

205205534121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

205205534121 is a deficient number, since it is larger than the sum of its proper divisors (107488613143).

205205534121 is an equidigital number, since it uses as much as digits as its factorization.

205205534121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9771692111.

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 205205534121 in words is "two hundred five billion, two hundred five million, five hundred thirty-four thousand, one hundred twenty-one".