420021111 has 8 divisors (see below), whose sum is σ = 560132464. Its totient is φ = 279961920.

The previous prime is 420021109. The next prime is 420021127. The reversal of 420021111 is 111120024.

It is a happy number.

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

It is not a de Polignac number, because 420021111 - 2¹ = 420021109 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 (420028111) 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 7 ways as a sum of consecutive naturals, for example, 13425 + ... + 31941.

It is an arithmetic number, because the mean of its divisors is an integer number (70016558).

Almost surely, 2^420021111 is an apocalyptic number.

420021111 is a deficient number, since it is larger than the sum of its proper divisors (140111353).

420021111 is a wasteful number, since it uses less digits than its factorization.

420021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26081.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 420021111 is about 20494.4165811081. The cubic root of 420021111 is about 748.8997859390.

Adding to 420021111 its reverse (111120024), we get a palindrome (531141135).

The spelling of 420021111 in words is "four hundred twenty million, twenty-one thousand, one hundred eleven".