22311221220 has 72 divisors (see below), whose sum is σ = 67711303296. Its totient is φ = 5946676032.

The previous prime is 22311221183. The next prime is 22311221239. The reversal of 22311221220 is 2212211322.

22311221220 is a `hidden beast` number, since 223 + 1 + 1 + 221 + 220 = 666.

It is a super-3 number, since 3×22311221220³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 22311221193 and 22311221202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 341299 + ... + 401381.

It is an arithmetic number, because the mean of its divisors is an integer number (940434768).

Almost surely, 2^22311221220 is an apocalyptic number.

22311221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22311221220 is an abundant number, since it is smaller than the sum of its proper divisors (45400082076).

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

22311221220 is a wasteful number, since it uses less digits than its factorization.

22311221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62161 (or 62156 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 22311221220 its reverse (2212211322), we get a palindrome (24523432542).

The spelling of 22311221220 in words is "twenty-two billion, three hundred eleven million, two hundred twenty-one thousand, two hundred twenty".