21220122101100 has 144 divisors (see below), whose sum is σ = 66916348246272. Its totient is φ = 5160481885440.

The previous prime is 21220122101099. The next prime is 21220122101173. The reversal of 21220122101100 is 110122102212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21220122101100.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32453752 + ... + 33101151.

Almost surely, 2^{21220122101100} is an apocalyptic number.

21220122101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220122101100 is an abundant number, since it is smaller than the sum of its proper divisors (45696226145172).

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

21220122101100 is a wasteful number, since it uses less digits than its factorization.

21220122101100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65555016 (or 65555009 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21220122101100 its reverse (110122102212), we get a palindrome (21330244203312).

The spelling of 21220122101100 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, one hundred one thousand, one hundred".