1211022111100 has 18 divisors (see below), whose sum is σ = 2627917981304. Its totient is φ = 484408844400.

The previous prime is 1211022111077. The next prime is 1211022111139. The reversal of 1211022111100 is 11112201121.

It is a happy number.

It is a super-4 number, since 4×1211022111100⁴ (a number of 49 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6055110456 + ... + 6055110655.

Almost surely, 2^{1211022111100} is an apocalyptic number.

1211022111100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211022111100 is an abundant number, since it is smaller than the sum of its proper divisors (1416895870204).

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

1211022111100 is a wasteful number, since it uses less digits than its factorization.

1211022111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12110221125 (or 12110221118 counting only the distinct ones).

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

Adding to 1211022111100 its reverse (11112201121), we get a palindrome (1222134312221).

The spelling of 1211022111100 in words is "one trillion, two hundred eleven billion, twenty-two million, one hundred eleven thousand, one hundred".