220121443 has 4 divisors (see below), whose sum is σ = 220183128. Its totient is φ = 220059760.

The previous prime is 220121437. The next prime is 220121449. The reversal of 220121443 is 344121022.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (220121437) and next prime (220121449).

It is a cyclic number.

It is not a de Polignac number, because 220121443 - 2⁵ = 220121411 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220121443.

It is not an unprimeable number, because it can be changed into a prime (220121449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25138 + ... + 32743.

It is an arithmetic number, because the mean of its divisors is an integer number (55045782).

Almost surely, 2^220121443 is an apocalyptic number.

220121443 is a deficient number, since it is larger than the sum of its proper divisors (61685).

220121443 is an equidigital number, since it uses as much as digits as its factorization.

220121443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61684.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 220121443 is about 14836.4902520778. The cubic root of 220121443 is about 603.7921333084.

Adding to 220121443 its reverse (344121022), we get a palindrome (564242465).

The spelling of 220121443 in words is "two hundred twenty million, one hundred twenty-one thousand, four hundred forty-three".