221100440 has 32 divisors (see below), whose sum is σ = 542702160. Its totient is φ = 80400000.

The previous prime is 221100421. The next prime is 221100443. The reversal of 221100440 is 44001122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250811 + ... + 251690.

Almost surely, 2^221100440 is an apocalyptic number.

221100440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221100440 is an abundant number, since it is smaller than the sum of its proper divisors (321601720).

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

221100440 is a wasteful number, since it uses less digits than its factorization.

221100440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502523 (or 502519 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221100440 is about 14869.4465263506. The cubic root of 221100440 is about 604.6859376711.

Adding to 221100440 its reverse (44001122), we get a palindrome (265101562).

The spelling of 221100440 in words is "two hundred twenty-one million, one hundred thousand, four hundred forty".