422404021 has 8 divisors (see below), whose sum is σ = 457440480. Its totient is φ = 387730992.

The previous prime is 422404019. The next prime is 422404027. The reversal of 422404021 is 120404224.

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

It is a cyclic number.

It is not a de Polignac number, because 422404021 - 2¹ = 422404019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 422404021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422404027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88435 + ... + 93088.

It is an arithmetic number, because the mean of its divisors is an integer number (57180060).

Almost surely, 2^422404021 is an apocalyptic number.

It is an amenable number.

422404021 is a deficient number, since it is larger than the sum of its proper divisors (35036459).

422404021 is a wasteful number, since it uses less digits than its factorization.

422404021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181715.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 422404021 is about 20552.4699488894. The cubic root of 422404021 is about 750.3133629792.

Adding to 422404021 its reverse (120404224), we get a palindrome (542808245).

The spelling of 422404021 in words is "four hundred twenty-two million, four hundred four thousand, twenty-one".