205458421 has 24 divisors (see below), whose sum is σ = 252806400. Its totient is φ = 166219200.

The previous prime is 205458391. The next prime is 205458437. The reversal of 205458421 is 124854502.

It is not a de Polignac number, because 205458421 - 2⁷ = 205458293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205458221) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 60630 + ... + 63928.

It is an arithmetic number, because the mean of its divisors is an integer number (10533600).

Almost surely, 2^205458421 is an apocalyptic number.

It is an amenable number.

205458421 is a deficient number, since it is larger than the sum of its proper divisors (47347979).

205458421 is a wasteful number, since it uses less digits than its factorization.

205458421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3385 (or 3378 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 31.

The square root of 205458421 is about 14333.8208793050. The cubic root of 205458421 is about 590.0760420997.

The spelling of 205458421 in words is "two hundred five million, four hundred fifty-eight thousand, four hundred twenty-one".