221121300 has 72 divisors (see below), whose sum is σ = 651895776. Its totient is φ = 57848960.

The previous prime is 221121293. The next prime is 221121343. The reversal of 221121300 is 3121122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8947 + ... + 22853.

It is an arithmetic number, because the mean of its divisors is an integer number (9054108).

Almost surely, 2^221121300 is an apocalyptic number.

221121300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221121300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325947888).

221121300 is an abundant number, since it is smaller than the sum of its proper divisors (430774476).

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

221121300 is a wasteful number, since it uses less digits than its factorization.

221121300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13977 (or 13970 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 221121300 is about 14870.1479481544. The cubic root of 221121300 is about 604.7049536923.

Adding to 221121300 its reverse (3121122), we get a palindrome (224242422).

The spelling of 221121300 in words is "two hundred twenty-one million, one hundred twenty-one thousand, three hundred".