221457502004500 has 24 divisors (see below), whose sum is σ = 483663184378920. Its totient is φ = 88583000801600.

The previous prime is 221457502004461. The next prime is 221457502004521. The reversal of 221457502004500 is 5400205754122.

221457502004500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 62787050173584 + 158670451830916 = 7923828^2 + 12596446^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221457502004500.

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, 221457501505 + ... + 221457502504.

It is an arithmetic number, because the mean of its divisors is an integer number (20152632682455).

Almost surely, 2^{221457502004500} is an apocalyptic number.

221457502004500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221457502004500 is an abundant number, since it is smaller than the sum of its proper divisors (262205682374420).

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

221457502004500 is a wasteful number, since it uses less digits than its factorization.

221457502004500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442915004028 (or 442915004016 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 37.

Adding to 221457502004500 its reverse (5400205754122), we get a palindrome (226857707758622).

The spelling of 221457502004500 in words is "two hundred twenty-one trillion, four hundred fifty-seven billion, five hundred two million, four thousand, five hundred".