21220222210220 has 48 divisors (see below), whose sum is σ = 48996384288768. Its totient is φ = 7655685024960.

The previous prime is 21220222210199. The next prime is 21220222210247. The reversal of 21220222210220 is 2201222202212.

It is a super-2 number, since 2×21220222210220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21220222210192 and 21220222210201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379718342 + ... + 379774221.

It is an arithmetic number, because the mean of its divisors is an integer number (1020758006016).

Almost surely, 2^{21220222210220} is an apocalyptic number.

21220222210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220222210220 is an abundant number, since it is smaller than the sum of its proper divisors (27776162078548).

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

21220222210220 is a wasteful number, since it uses less digits than its factorization.

21220222210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759492710 (or 759492708 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21220222210220 its reverse (2201222202212), we get a palindrome (23421444412432).

It can be divided in two parts, 212202 and 22210220, that added together give a palindrome (22422422).

The spelling of 21220222210220 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-two million, two hundred ten thousand, two hundred twenty".