2121100221222 has 48 divisors (see below), whose sum is σ = 4784582343840. Its totient is φ = 678500758656.

The previous prime is 2121100221209. The next prime is 2121100221313. The reversal of 2121100221222 is 2221220011212.

It is a happy number.

2121100221222 is a `hidden beast` number, since 2 + 121 + 100 + 221 + 222 = 666.

It is a super-2 number, since 2×2121100221222² (a number of 25 digits) contains 22 as substring.

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 = 2121100221195 and 2121100221204.

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, 21765322 + ... + 21862557.

It is an arithmetic number, because the mean of its divisors is an integer number (99678798830).

Almost surely, 2^{2121100221222} is an apocalyptic number.

2121100221222 is an abundant number, since it is smaller than the sum of its proper divisors (2663482122618).

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

2121100221222 is a wasteful number, since it uses less digits than its factorization.

2121100221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43627997 (or 43627994 counting only the distinct ones).

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

Adding to 2121100221222 its reverse (2221220011212), we get a palindrome (4342320232434).

The spelling of 2121100221222 in words is "two trillion, one hundred twenty-one billion, one hundred million, two hundred twenty-one thousand, two hundred twenty-two".