1210221111100 has 72 divisors (see below), whose sum is σ = 2654108403968. Its totient is φ = 478943539200.

The previous prime is 1210221111097. The next prime is 1210221111101. The reversal of 1210221111100 is 11111220121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210221111101) 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, 32874304 + ... + 32911096.

Almost surely, 2^{1210221111100} is an apocalyptic number.

1210221111100 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 1210221111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1327054201984).

1210221111100 is an abundant number, since it is smaller than the sum of its proper divisors (1443887292868).

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

1210221111100 is a wasteful number, since it uses less digits than its factorization.

1210221111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40295 (or 40288 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1210221111100 its reverse (11111220121), we get a palindrome (1221332331221).

The spelling of 1210221111100 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, one hundred eleven thousand, one hundred".