212100818 has 4 divisors (see below), whose sum is σ = 318151230. Its totient is φ = 106050408.

The previous prime is 212100799. The next prime is 212100841. The reversal of 212100818 is 818001212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 211033729 + 1067089 = 14527^2 + 1033^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212100793 and 212100802.

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 as a sum of consecutive naturals, namely, 53025203 + ... + 53025206.

Almost surely, 2^212100818 is an apocalyptic number.

212100818 is a deficient number, since it is larger than the sum of its proper divisors (106050412).

212100818 is a wasteful number, since it uses less digits than its factorization.

212100818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106050411.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 212100818 is about 14563.6814713863. The cubic root of 212100818 is about 596.3677013470.

The spelling of 212100818 in words is "two hundred twelve million, one hundred thousand, eight hundred eighteen".