22221221122100 has 288 divisors, whose sum is σ = 64756411324416. Its totient is φ = 6391994457600.

The previous prime is 22221221121973. The next prime is 22221221122123. The reversal of 22221221122100 is 122112212222.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 548828057 + ... + 548868543.

It is an arithmetic number, because the mean of its divisors is an integer number (224848650432).

Almost surely, 2^{22221221122100} is an apocalyptic number.

22221221122100 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 22221221122100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32378205662208).

22221221122100 is an abundant number, since it is smaller than the sum of its proper divisors (42535190202316).

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

22221221122100 is a wasteful number, since it uses less digits than its factorization.

22221221122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46015 (or 46008 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22221221122100 its reverse (122112212222), we get a palindrome (22343333334322).

It can be divided in two parts, 222212 and 21122100, that added together give a palindrome (21344312).

The spelling of 22221221122100 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred".