221036040 has 160 divisors (see below), whose sum is σ = 786824280. Its totient is φ = 55461888.

The previous prime is 221036021. The next prime is 221036051. The reversal of 221036040 is 40630122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 217326564 + 3709476 = 14742^2 + 1926^2 .

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

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 53074 + ... + 57086.

Almost surely, 2^221036040 is an apocalyptic number.

221036040 is a gapful number since it is divisible by the number (20) 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 221036040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393412140).

221036040 is an abundant number, since it is smaller than the sum of its proper divisors (565788240).

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

221036040 is a wasteful number, since it uses less digits than its factorization.

221036040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4053 (or 4040 counting only the distinct ones).

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

The square root of 221036040 is about 14867.2808542786. The cubic root of 221036040 is about 604.6272229442.

Adding to 221036040 its reverse (40630122), we get a palindrome (261666162).

The spelling of 221036040 in words is "two hundred twenty-one million, thirty-six thousand, forty".