1211021103100 has 72 divisors (see below), whose sum is σ = 2662317444528. Its totient is φ = 478079155200.

The previous prime is 1211021103073. The next prime is 1211021103101. The reversal of 1211021103100 is 13011201121.

It is a happy number.

It is a super-2 number, since 2×1211021103100² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211021103101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8034430 + ... + 8183770.

It is an arithmetic number, because the mean of its divisors is an integer number (36976631174).

Almost surely, 2^{1211021103100} is an apocalyptic number.

1211021103100 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 1211021103100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1331158722264).

1211021103100 is an abundant number, since it is smaller than the sum of its proper divisors (1451296341428).

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

1211021103100 is a wasteful number, since it uses less digits than its factorization.

1211021103100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150415 (or 150408 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 1211021103100 its reverse (13011201121), we get a palindrome (1224032304221).

The spelling of 1211021103100 in words is "one trillion, two hundred eleven billion, twenty-one million, one hundred three thousand, one hundred".