205602421 has 2 divisors, whose sum is σ = 205602422. Its totient is φ = 205602420.

The previous prime is 205602389. The next prime is 205602427. The reversal of 205602421 is 124206502.

205602421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194909521 + 10692900 = 13961^2 + 3270^2 .

It is a cyclic number.

It is not a de Polignac number, because 205602421 - 2⁵ = 205602389 is a prime.

It is a super-2 number, since 2×205602421² = 84544711042122482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205602392 and 205602401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205602427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102801210 + 102801211.

It is an arithmetic number, because the mean of its divisors is an integer number (102801211).

Almost surely, 2^205602421 is an apocalyptic number.

It is an amenable number.

205602421 is a deficient number, since it is larger than the sum of its proper divisors (1).

205602421 is an equidigital number, since it uses as much as digits as its factorization.

205602421 is an evil number, because the sum of its binary digits is even.

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

The square root of 205602421 is about 14338.8430844333. The cubic root of 205602421 is about 590.2138657789.

Adding to 205602421 its reverse (124206502), we get a palindrome (329808923).

The spelling of 205602421 in words is "two hundred five million, six hundred two thousand, four hundred twenty-one".