205621413 has 8 divisors (see below), whose sum is σ = 274349376. Its totient is φ = 136987200.

The previous prime is 205621393. The next prime is 205621421. The reversal of 205621413 is 314126502.

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

It is not a de Polignac number, because 205621413 - 2⁶ = 205621349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205621483) 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, 18148 + ... + 27213.

It is an arithmetic number, because the mean of its divisors is an integer number (34293672).

Almost surely, 2^205621413 is an apocalyptic number.

It is an amenable number.

205621413 is a deficient number, since it is larger than the sum of its proper divisors (68727963).

205621413 is a wasteful number, since it uses less digits than its factorization.

205621413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46875.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 205621413 is about 14339.5053261959. The cubic root of 205621413 is about 590.2320383870.

Adding to 205621413 its reverse (314126502), we get a palindrome (519747915).

The spelling of 205621413 in words is "two hundred five million, six hundred twenty-one thousand, four hundred thirteen".