212120995818 has 32 divisors (see below), whose sum is σ = 430459797312. Its totient is φ = 69672528000.

The previous prime is 212120995817. The next prime is 212120995831. The reversal of 212120995818 is 818599021212.

It is a super-3 number, since 3×212120995818³ (a number of 35 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (212120995811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236493 + ... + 692943.

It is an arithmetic number, because the mean of its divisors is an integer number (13451868666).

Almost surely, 2^212120995818 is an apocalyptic number.

212120995818 is an abundant number, since it is smaller than the sum of its proper divisors (218338801494).

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

212120995818 is a wasteful number, since it uses less digits than its factorization.

212120995818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457590.

The product of its (nonzero) digits is 207360, while the sum is 48.

The spelling of 212120995818 in words is "two hundred twelve billion, one hundred twenty million, nine hundred ninety-five thousand, eight hundred eighteen".