212021000117 has 4 divisors (see below), whose sum is σ = 213568598796. Its totient is φ = 210473401440.

The previous prime is 212021000111. The next prime is 212021000141. The reversal of 212021000117 is 711000120212.

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 149707860241 + 62313139876 = 386921^2 + 249626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212021000117 is a prime.

It is a super-2 number, since 2×212021000117² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021000095 and 212021000104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021000111) 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, 773799134 + ... + 773799407.

It is an arithmetic number, because the mean of its divisors is an integer number (53392149699).

Almost surely, 2^212021000117 is an apocalyptic number.

It is an amenable number.

212021000117 is a deficient number, since it is larger than the sum of its proper divisors (1547598679).

212021000117 is a wasteful number, since it uses less digits than its factorization.

212021000117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547598678.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 212021000117 its reverse (711000120212), we get a palindrome (923021120329).

The spelling of 212021000117 in words is "two hundred twelve billion, twenty-one million, one hundred seventeen", and thus it is an aban number.