21212305105045 has 8 divisors (see below), whose sum is σ = 26075614080600. Its totient is φ = 16555945447680.

The previous prime is 21212305104989. The next prime is 21212305105081. The reversal of 21212305105045 is 54050150321212.

It can be written as a sum of positive squares in 4 ways, for example, as 35981157969 + 21176323947076 = 189687^2 + 4601774^2 .

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

It is not a de Polignac number, because 21212305105045 - 2²¹ = 21212303007893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212305104998 and 21212305105016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51737329320 + ... + 51737329729.

It is an arithmetic number, because the mean of its divisors is an integer number (3259451760075).

Almost surely, 2^{21212305105045} is an apocalyptic number.

It is an amenable number.

21212305105045 is a deficient number, since it is larger than the sum of its proper divisors (4863308975555).

21212305105045 is a wasteful number, since it uses less digits than its factorization.

21212305105045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103474659095.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 21212305105045 its reverse (54050150321212), we get a palindrome (75262455426257).

The spelling of 21212305105045 in words is "twenty-one trillion, two hundred twelve billion, three hundred five million, one hundred five thousand, forty-five".