1222213211100 has 216 divisors, whose sum is σ = 4379194380288. Its totient is φ = 279302083200.

The previous prime is 1222213211099. The next prime is 1222213211123. The reversal of 1222213211100 is 11123122221.

1222213211100 is a `hidden beast` number, since 1 + 22 + 221 + 321 + 1 + 100 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 32936757 + ... + 32973843.

Almost surely, 2^{1222213211100} is an apocalyptic number.

1222213211100 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 1222213211100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2189597190144).

1222213211100 is an abundant number, since it is smaller than the sum of its proper divisors (3156981169188).

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

1222213211100 is a wasteful number, since it uses less digits than its factorization.

1222213211100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42345 (or 42335 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1222213211100 its reverse (11123122221), we get a palindrome (1233336333321).

The spelling of 1222213211100 in words is "one trillion, two hundred twenty-two billion, two hundred thirteen million, two hundred eleven thousand, one hundred".