205121555222 has 16 divisors (see below), whose sum is σ = 319006743552. Its totient is φ = 98815123560.

The previous prime is 205121555207. The next prime is 205121555231. The reversal of 205121555222 is 222555121502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7273178 + ... + 7301325.

It is an arithmetic number, because the mean of its divisors is an integer number (19937921472).

Almost surely, 2^205121555222 is an apocalyptic number.

205121555222 is a deficient number, since it is larger than the sum of its proper divisors (113885188330).

205121555222 is a wasteful number, since it uses less digits than its factorization.

205121555222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14574763.

The product of its (nonzero) digits is 20000, while the sum is 32.

Adding to 205121555222 its reverse (222555121502), we get a palindrome (427676676724).

The spelling of 205121555222 in words is "two hundred five billion, one hundred twenty-one million, five hundred fifty-five thousand, two hundred twenty-two".