21224162305215 has 12 divisors (see below), whose sum is σ = 36788547995784. Its totient is φ = 11319553229424.

The previous prime is 21224162305211. The next prime is 21224162305267. The reversal of 21224162305215 is 51250326142212.

21224162305215 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 4 + 1 + 623 + 0 + 5 + 21 + 5 = 666.

It is not a de Polignac number, because 21224162305215 - 2² = 21224162305211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21224162305215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224162305211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235824025569 + ... + 235824025658.

It is an arithmetic number, because the mean of its divisors is an integer number (3065712332982).

Almost surely, 2^{21224162305215} is an apocalyptic number.

21224162305215 is a deficient number, since it is larger than the sum of its proper divisors (15564385690569).

21224162305215 is a wasteful number, since it uses less digits than its factorization.

21224162305215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471648051238 (or 471648051235 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 21224162305215 its reverse (51250326142212), we get a palindrome (72474488447427).

The spelling of 21224162305215 in words is "twenty-one trillion, two hundred twenty-four billion, one hundred sixty-two million, three hundred five thousand, two hundred fifteen".