205535421 has 32 divisors (see below), whose sum is σ = 374769920. Its totient is φ = 108412992.

The previous prime is 205535401. The next prime is 205535461. The reversal of 205535421 is 124535502.

It is a happy number.

205535421 is a `hidden beast` number, since 205 + 5 + 35 + 421 = 666.

It is not a de Polignac number, because 205535421 - 2¹¹ = 205533373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205535401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39370 + ... + 44283.

It is an arithmetic number, because the mean of its divisors is an integer number (11711560).

Almost surely, 2^205535421 is an apocalyptic number.

205535421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

205535421 is a deficient number, since it is larger than the sum of its proper divisors (169234499).

205535421 is a wasteful number, since it uses less digits than its factorization.

205535421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83682 (or 83676 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 205535421 is about 14336.5065828465. The cubic root of 205535421 is about 590.1497474917.

The spelling of 205535421 in words is "two hundred five million, five hundred thirty-five thousand, four hundred twenty-one".