220121200 has 60 divisors (see below), whose sum is σ = 569534728. Its totient is φ = 81273600.

The previous prime is 220121189. The next prime is 220121203. The reversal of 220121200 is 2121022.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15966 + ... + 26365.

Almost surely, 2^220121200 is an apocalyptic number.

220121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220121200 is an abundant number, since it is smaller than the sum of its proper divisors (349413528).

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

220121200 is a wasteful number, since it uses less digits than its factorization.

220121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42362 (or 42351 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 220121200 is about 14836.4820628072. The cubic root of 220121200 is about 603.7919111256.

Adding to 220121200 its reverse (2121022), we get a palindrome (222242222).

The spelling of 220121200 in words is "two hundred twenty million, one hundred twenty-one thousand, two hundred".