422642621 has 4 divisors (see below), whose sum is σ = 422950044. Its totient is φ = 422335200.

The previous prime is 422642609. The next prime is 422642651. The reversal of 422642621 is 126246224.

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 173949721 + 248692900 = 13189^2 + 15770^2 .

It is a cyclic number.

It is not a de Polignac number, because 422642621 - 2¹⁸ = 422380477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422642651) 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, 151640 + ... + 154401.

It is an arithmetic number, because the mean of its divisors is an integer number (105737511).

Almost surely, 2^422642621 is an apocalyptic number.

It is an amenable number.

422642621 is a deficient number, since it is larger than the sum of its proper divisors (307423).

422642621 is a wasteful number, since it uses less digits than its factorization.

422642621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307422.

The product of its digits is 9216, while the sum is 29.

The square root of 422642621 is about 20558.2737845375. The cubic root of 422642621 is about 750.4546109014.

Adding to 422642621 its reverse (126246224), we get a palindrome (548888845).

The spelling of 422642621 in words is "four hundred twenty-two million, six hundred forty-two thousand, six hundred twenty-one".