12221020 has 24 divisors (see below), whose sum is σ = 29330784. Its totient is φ = 4190016.

The previous prime is 12220997. The next prime is 12221021. The reversal of 12221020 is 2012221.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 12220988 and 12221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43507 + ... + 43786.

It is an arithmetic number, because the mean of its divisors is an integer number (1222116).

Almost surely, 2^12221020 is an apocalyptic number.

12221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221020 is an abundant number, since it is smaller than the sum of its proper divisors (17109764).

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

12221020 is a wasteful number, since it uses less digits than its factorization.

12221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87309 (or 87307 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 12221020 is about 3495.8575485852. The cubic root of 12221020 is about 230.3398881488.

Adding to 12221020 its reverse (2012221), we get a palindrome (14233241).

The spelling of 12221020 in words is "twelve million, two hundred twenty-one thousand, twenty".