22021131220 has 72 divisors (see below), whose sum is σ = 53820730152. Its totient is φ = 7536629760.

The previous prime is 22021131217. The next prime is 22021131221. The reversal of 22021131220 is 2213112022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9323447364 + 12697683856 = 96558^2 + 112684^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22021131194 and 22021131203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021131221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 226497 + ... + 308776.

It is an arithmetic number, because the mean of its divisors is an integer number (747510141).

Almost surely, 2^22021131220 is an apocalyptic number.

22021131220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22021131220 is an abundant number, since it is smaller than the sum of its proper divisors (31799598932).

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

22021131220 is a wasteful number, since it uses less digits than its factorization.

22021131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535321 (or 535308 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 22021131220 its reverse (2213112022), we get a palindrome (24234243242).

The spelling of 22021131220 in words is "twenty-two billion, twenty-one million, one hundred thirty-one thousand, two hundred twenty".