220221421 has 8 divisors (see below), whose sum is σ = 252101120. Its totient is φ = 188446608.

The previous prime is 220221409. The next prime is 220221431. The reversal of 220221421 is 124122022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 220221421 - 2⁹ = 220220909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220221395 and 220221404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220221431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21666 + ... + 30163.

It is an arithmetic number, because the mean of its divisors is an integer number (31512640).

Almost surely, 2^220221421 is an apocalyptic number.

It is an amenable number.

220221421 is a deficient number, since it is larger than the sum of its proper divisors (31879699).

220221421 is an equidigital number, since it uses as much as digits as its factorization.

220221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52443.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 220221421 is about 14839.8591974452. The cubic root of 220221421 is about 603.8835325410.

Adding to 220221421 its reverse (124122022), we get a palindrome (344343443).

The spelling of 220221421 in words is "two hundred twenty million, two hundred twenty-one thousand, four hundred twenty-one".