420220221 has 16 divisors (see below), whose sum is σ = 581621760. Its totient is φ = 269584560.

The previous prime is 420220217. The next prime is 420220231. The reversal of 420220221 is 122022024.

It is not a de Polignac number, because 420220221 - 2² = 420220217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420220201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4026 + ... + 29268.

It is an arithmetic number, because the mean of its divisors is an integer number (36351360).

Almost surely, 2^420220221 is an apocalyptic number.

It is an amenable number.

420220221 is a deficient number, since it is larger than the sum of its proper divisors (161401539).

420220221 is a wasteful number, since it uses less digits than its factorization.

420220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25456.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 420220221 is about 20499.2736700596. The cubic root of 420220221 is about 749.0181052936.

Adding to 420220221 its reverse (122022024), we get a palindrome (542242245).

The spelling of 420220221 in words is "four hundred twenty million, two hundred twenty thousand, two hundred twenty-one".