205121234047 has 2 divisors, whose sum is σ = 205121234048. Its totient is φ = 205121234046.

The previous prime is 205121234033. The next prime is 205121234081. The reversal of 205121234047 is 740432121502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205121234047 - 2¹⁵ = 205121201279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205121234347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102560617023 + 102560617024.

It is an arithmetic number, because the mean of its divisors is an integer number (102560617024).

Almost surely, 2^205121234047 is an apocalyptic number.

205121234047 is a deficient number, since it is larger than the sum of its proper divisors (1).

205121234047 is an equidigital number, since it uses as much as digits as its factorization.

205121234047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 31.

Adding to 205121234047 its reverse (740432121502), we get a palindrome (945553355549).

The spelling of 205121234047 in words is "two hundred five billion, one hundred twenty-one million, two hundred thirty-four thousand, forty-seven".