422440421 has 4 divisors (see below), whose sum is σ = 454935852. Its totient is φ = 389944992.

The previous prime is 422440411. The next prime is 422440423. The reversal of 422440421 is 124044224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54184321 + 368256100 = 7361^2 + 19190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-422440421 is a prime.

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 (422440423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16247696 + ... + 16247721.

It is an arithmetic number, because the mean of its divisors is an integer number (113733963).

Almost surely, 2^422440421 is an apocalyptic number.

It is an amenable number.

422440421 is a deficient number, since it is larger than the sum of its proper divisors (32495431).

422440421 is a wasteful number, since it uses less digits than its factorization.

422440421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32495430.

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 422440421 is about 20553.3554681468. The cubic root of 422440421 is about 750.3349147169.

Adding to 422440421 its reverse (124044224), we get a palindrome (546484645).

The spelling of 422440421 in words is "four hundred twenty-two million, four hundred forty thousand, four hundred twenty-one".