12221101020 has 24 divisors (see below), whose sum is σ = 34219083024. Its totient is φ = 3258960256.

The previous prime is 12221101007. The next prime is 12221101021. The reversal of 12221101020 is 2010112221.

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 = 12221100987 and 12221101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221101021) 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, 101842449 + ... + 101842568.

It is an arithmetic number, because the mean of its divisors is an integer number (1425795126).

Almost surely, 2^12221101020 is an apocalyptic number.

12221101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221101020 is an abundant number, since it is smaller than the sum of its proper divisors (21997982004).

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

12221101020 is a wasteful number, since it uses less digits than its factorization.

12221101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203685029 (or 203685027 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12221101020 its reverse (2010112221), we get a palindrome (14231213241).

The spelling of 12221101020 in words is "twelve billion, two hundred twenty-one million, one hundred one thousand, twenty".