221003545440 has 48 divisors (see below), whose sum is σ = 696161169648. Its totient is φ = 58934278656.

The previous prime is 221003545439. The next prime is 221003545459. The reversal of 221003545440 is 44545300122.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 221003545398 and 221003545407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230211547 + ... + 230212506.

It is an arithmetic number, because the mean of its divisors is an integer number (14503357701).

Almost surely, 2^221003545440 is an apocalyptic number.

221003545440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221003545440 is an abundant number, since it is smaller than the sum of its proper divisors (475157624208).

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

221003545440 is a wasteful number, since it uses less digits than its factorization.

221003545440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460424071 (or 460424063 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 221003545440 its reverse (44545300122), we get a palindrome (265548845562).

The spelling of 221003545440 in words is "two hundred twenty-one billion, three million, five hundred forty-five thousand, four hundred forty".