422421021 has 16 divisors (see below), whose sum is σ = 682701120. Its totient is φ = 256012560.

The previous prime is 422421011. The next prime is 422421023. The reversal of 422421021 is 120124224.

It is not a de Polignac number, because 422421021 - 2¹⁰ = 422419997 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 422420985 and 422421003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422421023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 710850 + ... + 711443.

It is an arithmetic number, because the mean of its divisors is an integer number (42668820).

Almost surely, 2^422421021 is an apocalyptic number.

It is an amenable number.

422421021 is a deficient number, since it is larger than the sum of its proper divisors (260280099).

422421021 is a wasteful number, since it uses less digits than its factorization.

422421021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422313 (or 1422307 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 422421021 is about 20552.8835203239. The cubic root of 422421021 is about 750.3234285053.

Adding to 422421021 its reverse (120124224), we get a palindrome (542545245).

The spelling of 422421021 in words is "four hundred twenty-two million, four hundred twenty-one thousand, twenty-one".