212120022100985 has 4 divisors (see below), whose sum is σ = 254544026521188. Its totient is φ = 169696017680784.

The previous prime is 212120022100963. The next prime is 212120022101017. The reversal of 212120022100985 is 589001220021212.

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 100205965945849 + 111914056155136 = 10010293^2 + 10578944^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120022100985 - 2⁸ = 212120022100729 is a prime.

It is a super-2 number, since 2×212120022100985² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21212002210094 + ... + 21212002210103.

It is an arithmetic number, because the mean of its divisors is an integer number (63636006630297).

Almost surely, 2^{212120022100985} is an apocalyptic number.

It is an amenable number.

212120022100985 is a deficient number, since it is larger than the sum of its proper divisors (42424004420203).

212120022100985 is an equidigital number, since it uses as much as digits as its factorization.

212120022100985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42424004420202.

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

The spelling of 212120022100985 in words is "two hundred twelve trillion, one hundred twenty billion, twenty-two million, one hundred thousand, nine hundred eighty-five".