221435412 has 48 divisors (see below), whose sum is σ = 566092800. Its totient is φ = 66811360.

The previous prime is 221435411. The next prime is 221435413. The reversal of 221435412 is 214534122.

It is an interprime number because it is at equal distance from previous prime (221435411) and next prime (221435413).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221435411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28039 + ... + 35057.

It is an arithmetic number, because the mean of its divisors is an integer number (11793600).

Almost surely, 2^221435412 is an apocalyptic number.

221435412 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 221435412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283046400).

221435412 is an abundant number, since it is smaller than the sum of its proper divisors (344657388).

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

221435412 is a wasteful number, since it uses less digits than its factorization.

221435412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7276 (or 7274 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 221435412 is about 14880.7060316371. The cubic root of 221435412 is about 604.9911543911.

Adding to 221435412 its reverse (214534122), we get a palindrome (435969534).

The spelling of 221435412 in words is "two hundred twenty-one million, four hundred thirty-five thousand, four hundred twelve".