22021020221220 has 72 divisors (see below), whose sum is σ = 70726335543864. Its totient is φ = 5526844290048.

The previous prime is 22021020221219. The next prime is 22021020221273. The reversal of 22021020221220 is 2212202012022.

22021020221220 is a `hidden beast` number, since 2 + 20 + 210 + 202 + 212 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6245570784996 + 15775449436224 = 2499114^2 + 3971832^2 .

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 = 22021020221193 and 22021020221202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3598202859 + ... + 3598208978.

It is an arithmetic number, because the mean of its divisors is an integer number (982310215887).

Almost surely, 2^{22021020221220} is an apocalyptic number.

22021020221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22021020221220 is an abundant number, since it is smaller than the sum of its proper divisors (48705315322644).

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

22021020221220 is a wasteful number, since it uses less digits than its factorization.

22021020221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7196411869 (or 7196411864 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22021020221220 its reverse (2212202012022), we get a palindrome (24233222233242).

The spelling of 22021020221220 in words is "twenty-two trillion, twenty-one billion, twenty million, two hundred twenty-one thousand, two hundred twenty".