21111412412224 has 28 divisors (see below), whose sum is σ = 41893728491268. Its totient is φ = 10555512320000.

The previous prime is 21111412412213. The next prime is 21111412412231. The reversal of 21111412412224 is 42221421411112.

It can be written as a sum of positive squares in 2 ways, for example, as 19843176066624 + 1268236345600 = 4454568^2 + 1126160^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21111412412192 and 21111412412201.

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, 514224 + ... + 6518224.

Almost surely, 2^{21111412412224} is an apocalyptic number.

It is an amenable number.

21111412412224 is a deficient number, since it is larger than the sum of its proper divisors (20782316079044).

21111412412224 is an equidigital number, since it uses as much as digits as its factorization.

21111412412224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6058954 (or 6058944 counting only the distinct ones).

The product of its digits is 2048, while the sum is 28.

Adding to 21111412412224 its reverse (42221421411112), we get a palindrome (63332833823336).

The spelling of 21111412412224 in words is "twenty-one trillion, one hundred eleven billion, four hundred twelve million, four hundred twelve thousand, two hundred twenty-four".