12211020 has 48 divisors (see below), whose sum is σ = 37991520. Its totient is φ = 3256128.

The previous prime is 12211009. The next prime is 12211021. The reversal of 12211020 is 2011221.

12211020 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12210993 and 12211011.

It is not an unprimeable number, because it can be changed into a prime (12211021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10767 + ... + 11846.

It is an arithmetic number, because the mean of its divisors is an integer number (791490).

Almost surely, 2^12211020 is an apocalyptic number.

12211020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12211020 is an abundant number, since it is smaller than the sum of its proper divisors (25780500).

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

12211020 is a wasteful number, since it uses less digits than its factorization.

12211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22631 (or 22623 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 12211020 is about 3494.4269916540. The cubic root of 12211020 is about 230.2770448556.

Adding to 12211020 its reverse (2011221), we get a palindrome (14222241).

The spelling of 12211020 in words is "twelve million, two hundred eleven thousand, twenty".