205421112 has 48 divisors (see below), whose sum is σ = 599147640. Its totient is φ = 63206208.

The previous prime is 205421107. The next prime is 205421131. The reversal of 205421112 is 211124502.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108798 + ... + 110669.

Almost surely, 2^205421112 is an apocalyptic number.

It is an amenable number.

205421112 is an abundant number, since it is smaller than the sum of its proper divisors (393726528).

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

205421112 is a wasteful number, since it uses less digits than its factorization.

205421112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219492 (or 219485 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 205421112 is about 14332.5193877420. The cubic root of 205421112 is about 590.0403228211.

Adding to 205421112 its reverse (211124502), we get a palindrome (416545614).

The spelling of 205421112 in words is "two hundred five million, four hundred twenty-one thousand, one hundred twelve".