1220220222021 has 12 divisors (see below), whose sum is σ = 1795795799148. Its totient is φ = 798131465664.

The previous prime is 1220220221977. The next prime is 1220220222041. The reversal of 1220220222021 is 1202220220221.

1220220222021 is a `hidden beast` number, since 1 + 220 + 2 + 202 + 220 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 747273802500 + 472946419521 = 864450^2 + 687711^2 .

It is not a de Polignac number, because 1220220222021 - 2¹¹ = 1220220219973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220220221985 and 1220220222003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220220222041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1279056360 + ... + 1279057313.

It is an arithmetic number, because the mean of its divisors is an integer number (149649649929).

Almost surely, 2^{1220220222021} is an apocalyptic number.

It is an amenable number.

1220220222021 is a deficient number, since it is larger than the sum of its proper divisors (575575577127).

1220220222021 is a wasteful number, since it uses less digits than its factorization.

1220220222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558113732 (or 2558113729 counting only the distinct ones).

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

Adding to 1220220222021 its reverse (1202220220221), we get a palindrome (2422440442242).

The spelling of 1220220222021 in words is "one trillion, two hundred twenty billion, two hundred twenty million, two hundred twenty-two thousand, twenty-one".