21122205033245 has 4 divisors (see below), whose sum is σ = 25346646039900. Its totient is φ = 16897764026592.

The previous prime is 21122205033239. The next prime is 21122205033287. The reversal of 21122205033245 is 54233050222112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14782817694649 + 6339387338596 = 3844843^2 + 2517814^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122205033245 - 2¹⁰ = 21122205032221 is a prime.

It is a super-2 number, since 2×21122205033245² (a number of 27 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 2112220503320 + ... + 2112220503329.

It is an arithmetic number, because the mean of its divisors is an integer number (6336661509975).

Almost surely, 2^{21122205033245} is an apocalyptic number.

It is an amenable number.

21122205033245 is a deficient number, since it is larger than the sum of its proper divisors (4224441006655).

21122205033245 is an equidigital number, since it uses as much as digits as its factorization.

21122205033245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4224441006654.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 21122205033245 its reverse (54233050222112), we get a palindrome (75355255255357).

The spelling of 21122205033245 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred five million, thirty-three thousand, two hundred forty-five".