12211021221020 has 12 divisors (see below), whose sum is σ = 25643144564184. Its totient is φ = 4884408488400.

The previous prime is 12211021220989. The next prime is 12211021221041. The reversal of 12211021221020 is 2012212011221.

It is a self number, because there is not a number n which added to its sum of digits gives 12211021221020.

It is a congruent number.

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, 305275530506 + ... + 305275530545.

It is an arithmetic number, because the mean of its divisors is an integer number (2136928713682).

Almost surely, 2^{12211021221020} is an apocalyptic number.

12211021221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12211021221020 is an abundant number, since it is smaller than the sum of its proper divisors (13432123343164).

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

12211021221020 is a wasteful number, since it uses less digits than its factorization.

12211021221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610551061060 (or 610551061058 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12211021221020 its reverse (2012212011221), we get a palindrome (14223233232241).

The spelling of 12211021221020 in words is "twelve trillion, two hundred eleven billion, twenty-one million, two hundred twenty-one thousand, twenty".