221254004500 has 48 divisors (see below), whose sum is σ = 483390769680. Its totient is φ = 88470096000.

The previous prime is 221254004473. The next prime is 221254004537. The reversal of 221254004500 is 5400452122.

It can be written as a sum of positive squares in 8 ways, for example, as 27784222596 + 193469781904 = 166686^2 + 439852^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1353166 + ... + 1507834.

It is an arithmetic number, because the mean of its divisors is an integer number (10070641035).

Almost surely, 2^221254004500 is an apocalyptic number.

221254004500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221254004500 is an abundant number, since it is smaller than the sum of its proper divisors (262136765180).

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

221254004500 is a wasteful number, since it uses less digits than its factorization.

221254004500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157549 (or 157537 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 221254004500 its reverse (5400452122), we get a palindrome (226654456622).

The spelling of 221254004500 in words is "two hundred twenty-one billion, two hundred fifty-four million, four thousand, five hundred".