205014021 has 16 divisors (see below), whose sum is σ = 283383360. Its totient is φ = 131680640.

The previous prime is 205014011. The next prime is 205014031. The reversal of 205014021 is 120410502.

205014021 = 349² + 350² + ... + 869².

It is an interprime number because it is at equal distance from previous prime (205014011) and next prime (205014031).

It is a cyclic number.

It is not a de Polignac number, because 205014021 - 2¹¹ = 205011973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205014001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43066 + ... + 47588.

It is an arithmetic number, because the mean of its divisors is an integer number (17711460).

Almost surely, 2^205014021 is an apocalyptic number.

It is an amenable number.

205014021 is a deficient number, since it is larger than the sum of its proper divisors (78369339).

205014021 is a wasteful number, since it uses less digits than its factorization.

205014021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5076.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 205014021 is about 14318.3106894633. The cubic root of 205014021 is about 589.6502964521.

Adding to 205014021 its reverse (120410502), we get a palindrome (325424523).

The spelling of 205014021 in words is "two hundred five million, fourteen thousand, twenty-one".