421721422 has 16 divisors (see below), whose sum is σ = 682849440. Its totient is φ = 194737312.

The previous prime is 421721411. The next prime is 421721437. The reversal of 421721422 is 224127124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156733 + ... + 159400.

It is an arithmetic number, because the mean of its divisors is an integer number (42678090).

Almost surely, 2^421721422 is an apocalyptic number.

421721422 is a deficient number, since it is larger than the sum of its proper divisors (261128018).

421721422 is a wasteful number, since it uses less digits than its factorization.

421721422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316187.

The product of its digits is 1792, while the sum is 25.

The square root of 421721422 is about 20535.8569823614. The cubic root of 421721422 is about 749.9089797690.

Adding to 421721422 its reverse (224127124), we get a palindrome (645848546).

The spelling of 421721422 in words is "four hundred twenty-one million, seven hundred twenty-one thousand, four hundred twenty-two".