21220001202216 has 32 divisors (see below), whose sum is σ = 53069106522240. Its totient is φ = 7070786598528.

The previous prime is 21220001202173. The next prime is 21220001202217. The reversal of 21220001202216 is 61220210002212.

It is a junction number, because it is equal to n+sod(n) for n = 21220001202192 and 21220001202201.

It is not an unprimeable number, because it can be changed into a prime (21220001202217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159127936 + ... + 159261231.

It is an arithmetic number, because the mean of its divisors is an integer number (1658409578820).

Almost surely, 2^{21220001202216} is an apocalyptic number.

It is an amenable number.

21220001202216 is an abundant number, since it is smaller than the sum of its proper divisors (31849105320024).

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

21220001202216 is a wasteful number, since it uses less digits than its factorization.

21220001202216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318391953 (or 318391949 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21220001202216 its reverse (61220210002212), we get a palindrome (82440211204428).

The spelling of 21220001202216 in words is "twenty-one trillion, two hundred twenty billion, one million, two hundred two thousand, two hundred sixteen".