222222121022100 has 144 divisors (see below), whose sum is σ = 644257103531328. Its totient is φ = 59139976028160.

The previous prime is 222222121022053. The next prime is 222222121022149. The reversal of 222222121022100 is 1220121222222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 780716007 + ... + 781000593.

It is an arithmetic number, because the mean of its divisors is an integer number (4474007663412).

Almost surely, 2^{222222121022100} is an apocalyptic number.

222222121022100 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 222222121022100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322128551765664).

222222121022100 is an abundant number, since it is smaller than the sum of its proper divisors (422034982509228).

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

222222121022100 is a wasteful number, since it uses less digits than its factorization.

222222121022100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289834 (or 289827 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 222222121022100 its reverse (1220121222222), we get a palindrome (223442242244322).

The spelling of 222222121022100 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, one hundred twenty-one million, twenty-two thousand, one hundred".