221203134 has 24 divisors (see below), whose sum is σ = 485051112. Its totient is φ = 72845520.

The previous prime is 221203123. The next prime is 221203153. The reversal of 221203134 is 431302122.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 72537 + ... + 75524.

It is an arithmetic number, because the mean of its divisors is an integer number (20210463).

Almost surely, 2^221203134 is an apocalyptic number.

221203134 is an abundant number, since it is smaller than the sum of its proper divisors (263847978).

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

221203134 is a wasteful number, since it uses less digits than its factorization.

221203134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148152 (or 148149 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 221203134 is about 14872.8993138527. The cubic root of 221203134 is about 604.7795421977.

Adding to 221203134 its reverse (431302122), we get a palindrome (652505256).

The spelling of 221203134 in words is "two hundred twenty-one million, two hundred three thousand, one hundred thirty-four".