221422432 has 96 divisors (see below), whose sum is σ = 551384064. Its totient is φ = 85017600.

The previous prime is 221422423. The next prime is 221422459. The reversal of 221422432 is 234224122.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179257 + ... + 180487.

It is an arithmetic number, because the mean of its divisors is an integer number (5743584).

Almost surely, 2^221422432 is an apocalyptic number.

221422432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221422432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275692032).

221422432 is an abundant number, since it is smaller than the sum of its proper divisors (329961632).

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

221422432 is a wasteful number, since it uses less digits than its factorization.

221422432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1324 counting only the distinct ones).

The product of its digits is 1536, while the sum is 22.

The square root of 221422432 is about 14880.2698900255. The cubic root of 221422432 is about 604.9793331282.

Adding to 221422432 its reverse (234224122), we get a palindrome (455646554).

The spelling of 221422432 in words is "two hundred twenty-one million, four hundred twenty-two thousand, four hundred thirty-two".