2100212121222 has 24 divisors (see below), whose sum is σ = 4656284239464. Its totient is φ = 683789992704.

The previous prime is 2100212121221. The next prime is 2100212121223. The reversal of 2100212121222 is 2221212120012.

It is a happy number.

2100212121222 is a `hidden beast` number, since 210 + 0 + 21 + 212 + 1 + 222 = 666.

It is an interprime number because it is at equal distance from previous prime (2100212121221) and next prime (2100212121223).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2100212121195 and 2100212121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100212121221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1356725403 + ... + 1356726950.

It is an arithmetic number, because the mean of its divisors is an integer number (194011843311).

Almost surely, 2^{2100212121222} is an apocalyptic number.

2100212121222 is an abundant number, since it is smaller than the sum of its proper divisors (2556072118242).

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

2100212121222 is a wasteful number, since it uses less digits than its factorization.

2100212121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713452404 (or 2713452401 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2100212121222 its reverse (2221212120012), we get a palindrome (4321424241234).

The spelling of 2100212121222 in words is "two trillion, one hundred billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-two".