220000421 has 4 divisors (see below), whose sum is σ = 220301292. Its totient is φ = 219699552.

The previous prime is 220000379. The next prime is 220000423. The reversal of 220000421 is 124000022.

220000421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 140541025 + 79459396 = 11855^2 + 8914^2 .

It is a cyclic number.

It is not a de Polignac number, because 220000421 - 2⁶ = 220000357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220000423) 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, 149336 + ... + 150801.

It is an arithmetic number, because the mean of its divisors is an integer number (55075323).

Almost surely, 2^220000421 is an apocalyptic number.

It is an amenable number.

220000421 is a deficient number, since it is larger than the sum of its proper divisors (300871).

220000421 is an equidigital number, since it uses as much as digits as its factorization.

220000421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300870.

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

The square root of 220000421 is about 14832.4111660916. The cubic root of 220000421 is about 603.6814587549.

Adding to 220000421 its reverse (124000022), we get a palindrome (344000443).

The spelling of 220000421 in words is "two hundred twenty million, four hundred twenty-one", and thus it is an aban number.