221320100 has 18 divisors (see below), whose sum is σ = 480264834. Its totient is φ = 88528000.

The previous prime is 221320079. The next prime is 221320153. The reversal of 221320100 is 1023122.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 58859584 + 162460516 = 7672^2 + 12746^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1106501 + ... + 1106700.

Almost surely, 2^221320100 is an apocalyptic number.

221320100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221320100 is an abundant number, since it is smaller than the sum of its proper divisors (258944734).

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

221320100 is a wasteful number, since it uses less digits than its factorization.

221320100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213215 (or 2213208 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 221320100 is about 14876.8309797483. The cubic root of 221320100 is about 604.8861202226.

Adding to 221320100 its reverse (1023122), we get a palindrome (222343222).

The spelling of 221320100 in words is "two hundred twenty-one million, three hundred twenty thousand, one hundred".