205042621 has 8 divisors (see below), whose sum is σ = 235550144. Its totient is φ = 174839040.

The previous prime is 205042613. The next prime is 205042633. The reversal of 205042621 is 126240502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205042621 - 2³ = 205042613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205042592 and 205042601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205042021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74535 + ... + 77236.

It is an arithmetic number, because the mean of its divisors is an integer number (29443768).

Almost surely, 2^205042621 is an apocalyptic number.

It is an amenable number.

205042621 is a deficient number, since it is larger than the sum of its proper divisors (30507523).

205042621 is a wasteful number, since it uses less digits than its factorization.

205042621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151971.

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

The square root of 205042621 is about 14319.3093758044. The cubic root of 205042621 is about 589.6777144376.

The spelling of 205042621 in words is "two hundred five million, forty-two thousand, six hundred twenty-one".