220421 has 2 divisors, whose sum is σ = 220422. Its totient is φ = 220420.

The previous prime is 220411. The next prime is 220447. The reversal of 220421 is 124022.

220421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136900 + 83521 = 370^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 220421 - 2⁶ = 220357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110210 + 110211.

It is an arithmetic number, because the mean of its divisors is an integer number (110211).

2²²⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

220421 is a deficient number, since it is larger than the sum of its proper divisors (1).

220421 is an equidigital number, since it uses as much as digits as its factorization.

220421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 220421 is about 469.4901489914. The cubic root of 220421 is about 60.4065903661.

Adding to 220421 its reverse (124022), we get a palindrome (344443).

The spelling of 220421 in words is "two hundred twenty thousand, four hundred twenty-one", and thus it is an iban number.