422400220421 has 4 divisors (see below), whose sum is σ = 424167585600. Its totient is φ = 420632855244.

The previous prime is 422400220351. The next prime is 422400220433. The reversal of 422400220421 is 124022004224.

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 a de Polignac number, because none of the positive numbers 2^k-422400220421 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 (422400222421) 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, 883682231 + ... + 883682708.

It is an arithmetic number, because the mean of its divisors is an integer number (106041896400).

Almost surely, 2^422400220421 is an apocalyptic number.

It is an amenable number.

422400220421 is a deficient number, since it is larger than the sum of its proper divisors (1767365179).

422400220421 is a wasteful number, since it uses less digits than its factorization.

422400220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767365178.

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

Adding to 422400220421 its reverse (124022004224), we get a palindrome (546422224645).

The spelling of 422400220421 in words is "four hundred twenty-two billion, four hundred million, two hundred twenty thousand, four hundred twenty-one".