21224162305216 has 28 divisors (see below), whose sum is σ = 45356443004992. Its totient is φ = 9795767217408.

The previous prime is 21224162305211. The next prime is 21224162305267. The reversal of 21224162305216 is 61250326142212.

It is a super-2 number, since 2×21224162305216² (a number of 27 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 12754904400 + ... + 12754906063.

It is an arithmetic number, because the mean of its divisors is an integer number (1619872964464).

Almost surely, 2^{21224162305216} is an apocalyptic number.

21224162305216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21224162305216 is an abundant number, since it is smaller than the sum of its proper divisors (24132280699776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21224162305216 is a wasteful number, since it uses less digits than its factorization.

21224162305216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25509810488 (or 25509810478 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

Adding to 21224162305216 its reverse (61250326142212), we get a palindrome (82474488447428).

The spelling of 21224162305216 in words is "twenty-one trillion, two hundred twenty-four billion, one hundred sixty-two million, three hundred five thousand, two hundred sixteen".