21242122412 has 12 divisors (see below), whose sum is σ = 42484244880. Its totient is φ = 9103766736.

The previous prime is 21242122409. The next prime is 21242122423. The reversal of 21242122412 is 21422124212.

21242122412 is an admirable number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379323587 + ... + 379323642.

It is an arithmetic number, because the mean of its divisors is an integer number (3540353740).

Almost surely, 2^21242122412 is an apocalyptic number.

It is an amenable number.

21242122412 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21242122412 is a wasteful number, since it uses less digits than its factorization.

21242122412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758647240 (or 758647238 counting only the distinct ones).

The product of its digits is 1024, while the sum is 23.

Adding to 21242122412 its reverse (21422124212), we get a palindrome (42664246624).

The spelling of 21242122412 in words is "twenty-one billion, two hundred forty-two million, one hundred twenty-two thousand, four hundred twelve".