212042101 has 4 divisors (see below), whose sum is σ = 212074092. Its totient is φ = 212010112.

The previous prime is 212042099. The next prime is 212042107. The reversal of 212042101 is 101240212.

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 54037201 + 158004900 = 7351^2 + 12570^2 .

It is a cyclic number.

It is not a de Polignac number, because 212042101 - 2¹ = 212042099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212042107) 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 3 ways as a sum of consecutive naturals, for example, 1930 + ... + 20683.

It is an arithmetic number, because the mean of its divisors is an integer number (53018523).

Almost surely, 2^212042101 is an apocalyptic number.

It is an amenable number.

212042101 is a deficient number, since it is larger than the sum of its proper divisors (31991).

212042101 is an equidigital number, since it uses as much as digits as its factorization.

212042101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31990.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 212042101 is about 14561.6654610659. The cubic root of 212042101 is about 596.3126643848.

Adding to 212042101 its reverse (101240212), we get a palindrome (313282313).

The spelling of 212042101 in words is "two hundred twelve million, forty-two thousand, one hundred one".