221145700 has 36 divisors (see below), whose sum is σ = 480562992. Its totient is φ = 88333600.

The previous prime is 221145671. The next prime is 221145703. The reversal of 221145700 is 7541122.

It is a happy number.

221145700 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221145703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108087 + ... + 110113.

It is an arithmetic number, because the mean of its divisors is an integer number (13348972).

Almost surely, 2^221145700 is an apocalyptic number.

221145700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221145700 is an abundant number, since it is smaller than the sum of its proper divisors (259417292).

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

221145700 is a wasteful number, since it uses less digits than its factorization.

221145700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132 (or 3125 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 221145700 is about 14870.9683612063. The cubic root of 221145700 is about 604.7271952677.

Adding to 221145700 its reverse (7541122), we get a palindrome (228686822).

The spelling of 221145700 in words is "two hundred twenty-one million, one hundred forty-five thousand, seven hundred".