221025500 has 48 divisors (see below), whose sum is σ = 511134624. Its totient is φ = 83206400.

The previous prime is 221025487. The next prime is 221025569. The reversal of 221025500 is 5520122.

221025500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4502 + ... + 21501.

It is an arithmetic number, because the mean of its divisors is an integer number (10648638).

Almost surely, 2^221025500 is an apocalyptic number.

221025500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221025500 is an abundant number, since it is smaller than the sum of its proper divisors (290109124).

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

221025500 is a wasteful number, since it uses less digits than its factorization.

221025500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26039 (or 26027 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 221025500 is about 14866.9263803921. The cubic root of 221025500 is about 604.6176123362.

Adding to 221025500 its reverse (5520122), we get a palindrome (226545622).

The spelling of 221025500 in words is "two hundred twenty-one million, twenty-five thousand, five hundred".