4220401421 has 4 divisors (see below), whose sum is σ = 4263910812. Its totient is φ = 4176892032.

The previous prime is 4220401333. The next prime is 4220401433. The reversal of 4220401421 is 1241040224.

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 2893256521 + 1327144900 = 53789^2 + 36430^2 .

It is a cyclic number.

It is not a de Polignac number, because 4220401421 - 2¹⁰ = 4220400397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4220401393 and 4220401402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4220401021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21754550 + ... + 21754743.

It is an arithmetic number, because the mean of its divisors is an integer number (1065977703).

Almost surely, 2^4220401421 is an apocalyptic number.

It is an amenable number.

4220401421 is a deficient number, since it is larger than the sum of its proper divisors (43509391).

4220401421 is an equidigital number, since it uses as much as digits as its factorization.

4220401421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43509390.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 4220401421 is about 64964.6166847770. The cubic root of 4220401421 is about 1616.0368272750.

Adding to 4220401421 its reverse (1241040224), we get a palindrome (5461441645).

The spelling of 4220401421 in words is "four billion, two hundred twenty million, four hundred one thousand, four hundred twenty-one".