212120010220985 has 4 divisors (see below), whose sum is σ = 254544012265188. Its totient is φ = 169696008176784.

The previous prime is 212120010220981. The next prime is 212120010220999. The reversal of 212120010220985 is 589022010021212.

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 2 ways, for example, as 51153621534976 + 160966388686009 = 7152176^2 + 12687253^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120010220985 - 2² = 212120010220981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212120010220981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21212001022094 + ... + 21212001022103.

It is an arithmetic number, because the mean of its divisors is an integer number (63636003066297).

Almost surely, 2^{212120010220985} is an apocalyptic number.

It is an amenable number.

212120010220985 is a deficient number, since it is larger than the sum of its proper divisors (42424002044203).

212120010220985 is an equidigital number, since it uses as much as digits as its factorization.

212120010220985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42424002044202.

The product of its (nonzero) digits is 11520, while the sum is 35.

The spelling of 212120010220985 in words is "two hundred twelve trillion, one hundred twenty billion, ten million, two hundred twenty thousand, nine hundred eighty-five".