221253204500 has 48 divisors (see below), whose sum is σ = 508649494080. Its totient is φ = 83843316000.

The previous prime is 221253204499. The next prime is 221253204503. The reversal of 221253204500 is 5402352122.

It is a self number, because there is not a number n which added to its sum of digits gives 221253204500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221253204503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11635406 + ... + 11654405.

It is an arithmetic number, because the mean of its divisors is an integer number (10596864460).

Almost surely, 2^221253204500 is an apocalyptic number.

221253204500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221253204500 is an abundant number, since it is smaller than the sum of its proper divisors (287396289580).

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

221253204500 is a wasteful number, since it uses less digits than its factorization.

221253204500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23289849 (or 23289837 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 221253204500 its reverse (5402352122), we get a palindrome (226655556622).

The spelling of 221253204500 in words is "two hundred twenty-one billion, two hundred fifty-three million, two hundred four thousand, five hundred".