21222016352516 has 24 divisors (see below), whose sum is σ = 43431103235520. Its totient is φ = 8883634751712.

The previous prime is 21222016352507. The next prime is 21222016352527. The reversal of 21222016352516 is 61525361022212.

It is a self number, because there is not a number n which added to its sum of digits gives 21222016352516.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8813128511 + ... + 8813130918.

It is an arithmetic number, because the mean of its divisors is an integer number (1809629301480).

Almost surely, 2^{21222016352516} is an apocalyptic number.

It is an amenable number.

21222016352516 is an abundant number, since it is smaller than the sum of its proper divisors (22209086883004).

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

21222016352516 is a wasteful number, since it uses less digits than its factorization.

21222016352516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17626259483 (or 17626259481 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

Adding to 21222016352516 its reverse (61525361022212), we get a palindrome (82747377374728).

The spelling of 21222016352516 in words is "twenty-one trillion, two hundred twenty-two billion, sixteen million, three hundred fifty-two thousand, five hundred sixteen".