21224150606345 has 4 divisors (see below), whose sum is σ = 25468980727620. Its totient is φ = 16979320485072.

The previous prime is 21224150606317. The next prime is 21224150606363. The reversal of 21224150606345 is 54360605142212.

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 2394313685449 + 18829836920896 = 1547357^2 + 4339336^2 .

It is a cyclic number.

It is not a de Polignac number, because 21224150606345 - 2²⁸ = 21223882170889 is a prime.

It is a super-3 number, since 3×21224150606345³ (a number of 41 digits) contains 333 as substring.

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, 2122415060630 + ... + 2122415060639.

It is an arithmetic number, because the mean of its divisors is an integer number (6367245181905).

Almost surely, 2^{21224150606345} is an apocalyptic number.

It is an amenable number.

21224150606345 is a deficient number, since it is larger than the sum of its proper divisors (4244830121275).

21224150606345 is an equidigital number, since it uses as much as digits as its factorization.

21224150606345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4244830121274.

The product of its (nonzero) digits is 345600, while the sum is 41.

Adding to 21224150606345 its reverse (54360605142212), we get a palindrome (75584755748557).

The spelling of 21224150606345 in words is "twenty-one trillion, two hundred twenty-four billion, one hundred fifty million, six hundred six thousand, three hundred forty-five".