422220421 has 4 divisors (see below), whose sum is σ = 482537632. Its totient is φ = 361903212.

The previous prime is 422220401. The next prime is 422220427. The reversal of 422220421 is 124022224.

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 422220421 - 2⁹ = 422219909 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 (422220427) 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, 30158595 + ... + 30158608.

It is an arithmetic number, because the mean of its divisors is an integer number (120634408).

Almost surely, 2^422220421 is an apocalyptic number.

It is an amenable number.

422220421 is a deficient number, since it is larger than the sum of its proper divisors (60317211).

422220421 is an equidigital number, since it uses as much as digits as its factorization.

422220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60317210.

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

The square root of 422220421 is about 20548.0028469922. The cubic root of 422220421 is about 750.2046380852.

Adding to 422220421 its reverse (124022224), we get a palindrome (546242645).

The spelling of 422220421 in words is "four hundred twenty-two million, two hundred twenty thousand, four hundred twenty-one".