222121202100 has 288 divisors, whose sum is σ = 743478414336. Its totient is φ = 50150707200.

The previous prime is 222121202059. The next prime is 222121202111. The reversal of 222121202100 is 1202121222.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 222121202100.

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, 197792139 + ... + 197793261.

It is an arithmetic number, because the mean of its divisors is an integer number (2581522272).

Almost surely, 2^222121202100 is an apocalyptic number.

222121202100 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 222121202100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371739207168).

222121202100 is an abundant number, since it is smaller than the sum of its proper divisors (521357212236).

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

222121202100 is a wasteful number, since it uses less digits than its factorization.

222121202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215 (or 2208 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 222121202100 its reverse (1202121222), we get a palindrome (223323323322).

The spelling of 222121202100 in words is "two hundred twenty-two billion, one hundred twenty-one million, two hundred two thousand, one hundred".