212021100222100 has 36 divisors (see below), whose sum is σ = 495477001906684. Its totient is φ = 78284713927680.

The previous prime is 212021100222077. The next prime is 212021100222179. The reversal of 212021100222100 is 1222001120212.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 45918133269264 + 166102966952836 = 6776292^2 + 12888094^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81546575709 + ... + 81546578308.

Almost surely, 2^{212021100222100} is an apocalyptic number.

212021100222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212021100222100 is an abundant number, since it is smaller than the sum of its proper divisors (283455901684584).

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

212021100222100 is a wasteful number, since it uses less digits than its factorization.

212021100222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163093154044 (or 163093154037 counting only the distinct ones).

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

Adding to 212021100222100 its reverse (1222001120212), we get a palindrome (213243101342312).

The spelling of 212021100222100 in words is "two hundred twelve trillion, twenty-one billion, one hundred million, two hundred twenty-two thousand, one hundred".