205121402 has 4 divisors (see below), whose sum is σ = 307682106. Its totient is φ = 102560700.

The previous prime is 205121393. The next prime is 205121419. The reversal of 205121402 is 204121502.

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., 137569441 + 67551961 = 11729^2 + 8219^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51280349 + ... + 51280352.

Almost surely, 2^205121402 is an apocalyptic number.

205121402 is a deficient number, since it is larger than the sum of its proper divisors (102560704).

205121402 is a wasteful number, since it uses less digits than its factorization.

205121402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102560703.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 205121402 is about 14322.0599775312. The cubic root of 205121402 is about 589.7532263017.

Adding to 205121402 its reverse (204121502), we get a palindrome (409242904).

The spelling of 205121402 in words is "two hundred five million, one hundred twenty-one thousand, four hundred two".