21420241222 has 12 divisors (see below), whose sum is σ = 32158494108. Its totient is φ = 10700750900.

The previous prime is 21420241217. The next prime is 21420241237. The reversal of 21420241222 is 22214202412.

It is a junction number, because it is equal to n+sod(n) for n = 21420241193 and 21420241202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4563897 + ... + 4568587.

It is an arithmetic number, because the mean of its divisors is an integer number (2679874509).

Almost surely, 2^21420241222 is an apocalyptic number.

21420241222 is a deficient number, since it is larger than the sum of its proper divisors (10738252886).

21420241222 is an frugal number, since it uses more digits than its factorization.

21420241222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7715 (or 6204 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21420241222 its reverse (22214202412), we get a palindrome (43634443634).

The spelling of 21420241222 in words is "twenty-one billion, four hundred twenty million, two hundred forty-one thousand, two hundred twenty-two".