422501021 has 4 divisors (see below), whose sum is σ = 424184544. Its totient is φ = 420817500.

The previous prime is 422500999. The next prime is 422501047. The reversal of 422501021 is 120105224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 422501021 - 2⁶ = 422500957 is a prime.

It is a super-2 number, since 2×422501021² = 357014225492084882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422501621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841385 + ... + 841886.

It is an arithmetic number, because the mean of its divisors is an integer number (106046136).

Almost surely, 2^422501021 is an apocalyptic number.

It is an amenable number.

422501021 is a deficient number, since it is larger than the sum of its proper divisors (1683523).

422501021 is a wasteful number, since it uses less digits than its factorization.

422501021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683522.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 422501021 is about 20554.8296271217. The cubic root of 422501021 is about 750.3707920615.

Adding to 422501021 its reverse (120105224), we get a palindrome (542606245).

The spelling of 422501021 in words is "four hundred twenty-two million, five hundred one thousand, twenty-one".