221996440 has 48 divisors (see below), whose sum is σ = 505026000. Its totient is φ = 87823296.

The previous prime is 221996419. The next prime is 221996447. The reversal of 221996440 is 44699122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221996440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221996447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1115461 + ... + 1115659.

It is an arithmetic number, because the mean of its divisors is an integer number (10521375).

Almost surely, 2^221996440 is an apocalyptic number.

221996440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221996440 is an abundant number, since it is smaller than the sum of its proper divisors (283029560).

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

221996440 is a wasteful number, since it uses less digits than its factorization.

221996440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 221996440 is about 14899.5449594946. The cubic root of 221996440 is about 605.5016580010.

The spelling of 221996440 in words is "two hundred twenty-one million, nine hundred ninety-six thousand, four hundred forty".