21222112412 has 6 divisors (see below), whose sum is σ = 37138696728. Its totient is φ = 10611056204.

The previous prime is 21222112403. The next prime is 21222112421. The reversal of 21222112412 is 21421122212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21222112403) and next prime (21222112421).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652764048 + ... + 2652764055.

It is an arithmetic number, because the mean of its divisors is an integer number (6189782788).

Almost surely, 2^21222112412 is an apocalyptic number.

It is an amenable number.

21222112412 is a deficient number, since it is larger than the sum of its proper divisors (15916584316).

21222112412 is a wasteful number, since it uses less digits than its factorization.

21222112412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305528107 (or 5305528105 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

Adding to 21222112412 its reverse (21421122212), we get a palindrome (42643234624).

The spelling of 21222112412 in words is "twenty-one billion, two hundred twenty-two million, one hundred twelve thousand, four hundred twelve".