21421421422 has 8 divisors (see below), whose sum is σ = 32179596696. Its totient is φ = 10694889192.

The previous prime is 21421421377. The next prime is 21421421471. The reversal of 21421421422 is 22412412412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7909068 + ... + 7911775.

It is an arithmetic number, because the mean of its divisors is an integer number (4022449587).

Almost surely, 2^21421421422 is an apocalyptic number.

21421421422 is a deficient number, since it is larger than the sum of its proper divisors (10758175274).

21421421422 is a wasteful number, since it uses less digits than its factorization.

21421421422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15821522.

The product of its digits is 2048, while the sum is 25.

Adding to 21421421422 its reverse (22412412412), we get a palindrome (43833833834).

The spelling of 21421421422 in words is "twenty-one billion, four hundred twenty-one million, four hundred twenty-one thousand, four hundred twenty-two".