1222220202021 has 72 divisors (see below), whose sum is σ = 2271410911224. Its totient is φ = 627263481600.

The previous prime is 1222220202011. The next prime is 1222220202023. The reversal of 1222220202021 is 1202020222221.

1222220202021 is a `hidden beast` number, since 1 + 222 + 220 + 20 + 202 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 470375133921 + 751845068100 = 685839^2 + 867090^2 .

It is not a de Polignac number, because 1222220202021 - 2⁶ = 1222220201957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222220201985 and 1222220202003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222220202023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2668830 + ... + 3093071.

It is an arithmetic number, because the mean of its divisors is an integer number (31547373767).

Almost surely, 2^{1222220202021} is an apocalyptic number.

It is an amenable number.

1222220202021 is a deficient number, since it is larger than the sum of its proper divisors (1049190709203).

1222220202021 is a wasteful number, since it uses less digits than its factorization.

1222220202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5761971 (or 5761961 counting only the distinct ones).

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

Adding to 1222220202021 its reverse (1202020222221), we get a palindrome (2424240424242).

It can be divided in two parts, 1222220 and 202021, that added together give a palindrome (1424241).

The spelling of 1222220202021 in words is "one trillion, two hundred twenty-two billion, two hundred twenty million, two hundred two thousand, twenty-one".