22121211111100 has 72 divisors (see below), whose sum is σ = 48865850298608. Its totient is φ = 8689890124800.

The previous prime is 22121211111061. The next prime is 22121211111119. The reversal of 22121211111100 is 111111212122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1102372 + ... + 6742228.

Almost surely, 2^{22121211111100} is an apocalyptic number.

22121211111100 is a gapful number since it is divisible by the number (20) 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 22121211111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24432925149304).

22121211111100 is an abundant number, since it is smaller than the sum of its proper divisors (26744639187508).

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

22121211111100 is a wasteful number, since it uses less digits than its factorization.

22121211111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5640575 (or 5640568 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 22121211111100 its reverse (111111212122), we get a palindrome (22232322323222).

The spelling of 22121211111100 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, one hundred".