205421214 has 16 divisors (see below), whose sum is σ = 411005952. Its totient is φ = 68446488.

The previous prime is 205421207. The next prime is 205421233. The reversal of 205421214 is 412124502.

It is a super-2 number, since 2×205421214² = 84395750322467592, which contains 22 as substring.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 14787 + ... + 25089.

It is an arithmetic number, because the mean of its divisors is an integer number (25687872).

Almost surely, 2^205421214 is an apocalyptic number.

205421214 is an abundant number, since it is smaller than the sum of its proper divisors (205584738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205421214 is a wasteful number, since it uses less digits than its factorization.

205421214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13631.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 205421214 is about 14332.5229460831. The cubic root of 205421214 is about 590.0404204808.

Adding to 205421214 its reverse (412124502), we get a palindrome (617545716).

The spelling of 205421214 in words is "two hundred five million, four hundred twenty-one thousand, two hundred fourteen".