2212121220100 has 72 divisors (see below), whose sum is σ = 5364418592736. Its totient is φ = 784788000000.

The previous prime is 2212121220097. The next prime is 2212121220131. The reversal of 2212121220100 is 10221212122.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24479526 + ... + 24569725.

It is an arithmetic number, because the mean of its divisors is an integer number (74505813788).

Almost surely, 2^{2212121220100} is an apocalyptic number.

2212121220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2212121220100 is an abundant number, since it is smaller than the sum of its proper divisors (3152297372636).

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

2212121220100 is a wasteful number, since it uses less digits than its factorization.

2212121220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49049317 (or 49049310 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2212121220100 its reverse (10221212122), we get a palindrome (2222342432222).

The spelling of 2212121220100 in words is "two trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty thousand, one hundred".