1211102221020 has 96 divisors (see below), whose sum is σ = 3483469819200. Its totient is φ = 314165827584.

The previous prime is 1211102221003. The next prime is 1211102221027. The reversal of 1211102221020 is 201222011121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211102221027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10976286 + ... + 11086074.

It is an arithmetic number, because the mean of its divisors is an integer number (36286143950).

Almost surely, 2^{1211102221020} is an apocalyptic number.

1211102221020 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 1211102221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1741734909600).

1211102221020 is an abundant number, since it is smaller than the sum of its proper divisors (2272367598180).

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

1211102221020 is a wasteful number, since it uses less digits than its factorization.

1211102221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114807 (or 114805 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1211102221020 its reverse (201222011121), we get a palindrome (1412324232141).

The spelling of 1211102221020 in words is "one trillion, two hundred eleven billion, one hundred two million, two hundred twenty-one thousand, twenty".