12221002020 has 144 divisors (see below), whose sum is σ = 35476608384. Its totient is φ = 3141504000.

The previous prime is 12221001997. The next prime is 12221002021. The reversal of 12221002020 is 2020012221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12221001987 and 12221002005.

It is not an unprimeable number, because it can be changed into a prime (12221002021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25094217 + ... + 25094703.

It is an arithmetic number, because the mean of its divisors is an integer number (246365336).

Almost surely, 2^12221002020 is an apocalyptic number.

12221002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12221002020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17738304192).

12221002020 is an abundant number, since it is smaller than the sum of its proper divisors (23255606364).

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

12221002020 is a wasteful number, since it uses less digits than its factorization.

12221002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 12221002020 its reverse (2020012221), we get a palindrome (14241014241).

The spelling of 12221002020 in words is "twelve billion, two hundred twenty-one million, two thousand, twenty".