221443734 has 16 divisors (see below), whose sum is σ = 468939888. Its totient is φ = 69472512.

The previous prime is 221443723. The next prime is 221443741. The reversal of 221443734 is 437344122.

It is a congruent number.

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, 1085407 + ... + 1085610.

It is an arithmetic number, because the mean of its divisors is an integer number (29308743).

Almost surely, 2^221443734 is an apocalyptic number.

221443734 is an abundant number, since it is smaller than the sum of its proper divisors (247496154).

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

221443734 is a wasteful number, since it uses less digits than its factorization.

221443734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171039.

The product of its digits is 16128, while the sum is 30.

The square root of 221443734 is about 14880.9856528390. The cubic root of 221443734 is about 604.9987332351.

Adding to 221443734 its reverse (437344122), we get a palindrome (658787856).

It can be divided in two parts, 22144 and 3734, that added together give a triangular number (25878 = T₂₂₇).

The spelling of 221443734 in words is "two hundred twenty-one million, four hundred forty-three thousand, seven hundred thirty-four".