12221022020 has 12 divisors (see below), whose sum is σ = 25664146284. Its totient is φ = 4888408800.

The previous prime is 12221022017. The next prime is 12221022043. The reversal of 12221022020 is 2022012221.

It can be written as a sum of positive squares in 2 ways, for example, as 8895885124 + 3325136896 = 94318^2 + 57664^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12221021986 and 12221022004.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305525531 + ... + 305525570.

It is an arithmetic number, because the mean of its divisors is an integer number (2138678857).

Almost surely, 2^12221022020 is an apocalyptic number.

12221022020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221022020 is an abundant number, since it is smaller than the sum of its proper divisors (13443124264).

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

12221022020 is a wasteful number, since it uses less digits than its factorization.

12221022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611051110 (or 611051108 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 12221022020 its reverse (2022012221), we get a palindrome (14243034241).

The spelling of 12221022020 in words is "twelve billion, two hundred twenty-one million, twenty-two thousand, twenty".