205211434 has 4 divisors (see below), whose sum is σ = 307817154. Its totient is φ = 102605716.

The previous prime is 205211431. The next prime is 205211449. The reversal of 205211434 is 434112502.

205211434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 170224209 + 34987225 = 13047^2 + 5915^2 .

It is a super-2 number, since 2×205211434² = 84223465288672712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205211431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51302857 + ... + 51302860.

Almost surely, 2^205211434 is an apocalyptic number.

205211434 is a deficient number, since it is larger than the sum of its proper divisors (102605720).

205211434 is a wasteful number, since it uses less digits than its factorization.

205211434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102605719.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 205211434 is about 14325.2027559822. The cubic root of 205211434 is about 589.8394986189.

Adding to 205211434 its reverse (434112502), we get a palindrome (639323936).

The spelling of 205211434 in words is "two hundred five million, two hundred eleven thousand, four hundred thirty-four".