212020101 has 12 divisors (see below), whose sum is σ = 314528812. Its totient is φ = 137526336.

The previous prime is 212020063. The next prime is 212020103. The reversal of 212020101 is 101020212.

It can be written as a sum of positive squares in 2 ways, for example, as 155002500 + 57017601 = 12450^2 + 7551^2 .

It is not a de Polignac number, because 212020101 - 2⁶ = 212020037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212020103) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 318016 + ... + 318681.

Almost surely, 2^212020101 is an apocalyptic number.

It is an amenable number.

212020101 is a deficient number, since it is larger than the sum of its proper divisors (102508711).

212020101 is a wasteful number, since it uses less digits than its factorization.

212020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636740 (or 636737 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 212020101 is about 14560.9100333736. The cubic root of 212020101 is about 596.2920405994.

Adding to 212020101 its reverse (101020212), we get a palindrome (313040313).

The spelling of 212020101 in words is "two hundred twelve million, twenty thousand, one hundred one".