205514021 has 4 divisors (see below), whose sum is σ = 211068492. Its totient is φ = 199959552.

The previous prime is 205514011. The next prime is 205514047. The reversal of 205514021 is 120415502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 123520996 + 81993025 = 11114^2 + 9055^2 .

It is a cyclic number.

It is not a de Polignac number, because 205514021 - 2¹⁴ = 205497637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205513984 and 205514002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205514011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2777180 + ... + 2777253.

It is an arithmetic number, because the mean of its divisors is an integer number (52767123).

Almost surely, 2^205514021 is an apocalyptic number.

It is an amenable number.

205514021 is a deficient number, since it is larger than the sum of its proper divisors (5554471).

205514021 is an equidigital number, since it uses as much as digits as its factorization.

205514021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5554470.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 205514021 is about 14335.7602170237. The cubic root of 205514021 is about 590.1292649834.

Adding to 205514021 its reverse (120415502), we get a palindrome (325929523).

The spelling of 205514021 in words is "two hundred five million, five hundred fourteen thousand, twenty-one".