221421234 has 16 divisors (see below), whose sum is σ = 443088000. Its totient is φ = 73766160.

The previous prime is 221421173. The next prime is 221421241. The reversal of 221421234 is 432124122.

It is a self number, because there is not a number n which added to its sum of digits gives 221421234.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2764 + ... + 21224.

It is an arithmetic number, because the mean of its divisors is an integer number (27693000).

Almost surely, 2^221421234 is an apocalyptic number.

221421234 is an abundant number, since it is smaller than the sum of its proper divisors (221666766).

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

221421234 is a wasteful number, since it uses less digits than its factorization.

221421234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20465.

The product of its digits is 768, while the sum is 21.

The square root of 221421234 is about 14880.2296353249. The cubic root of 221421234 is about 604.9782420516.

Adding to 221421234 its reverse (432124122), we get a palindrome (653545356).

The spelling of 221421234 in words is "two hundred twenty-one million, four hundred twenty-one thousand, two hundred thirty-four".