420021422 has 8 divisors (see below), whose sum is σ = 643437216. Its totient is φ = 205542352.

The previous prime is 420021421. The next prime is 420021451. The reversal of 420021422 is 224120024.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 420021422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420021421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2234063 + ... + 2234250.

It is an arithmetic number, because the mean of its divisors is an integer number (80429652).

Almost surely, 2^420021422 is an apocalyptic number.

420021422 is a deficient number, since it is larger than the sum of its proper divisors (223415794).

420021422 is a wasteful number, since it uses less digits than its factorization.

420021422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4468362.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 420021422 is about 20494.4241685391. The cubic root of 420021422 is about 748.8999707772.

Adding to 420021422 its reverse (224120024), we get a palindrome (644141446).

The spelling of 420021422 in words is "four hundred twenty million, twenty-one thousand, four hundred twenty-two".