212102021101 has 4 divisors (see below), whose sum is σ = 212927321052. Its totient is φ = 211276721152.

The previous prime is 212102021051. The next prime is 212102021129. The reversal of 212102021101 is 101120201212.

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 197579361001 + 14522660100 = 444499^2 + 120510^2 .

It is a cyclic number.

It is not a de Polignac number, because 212102021101 - 2¹¹ = 212102019053 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 (212102021401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412649590 + ... + 412650103.

It is an arithmetic number, because the mean of its divisors is an integer number (53231830263).

Almost surely, 2^212102021101 is an apocalyptic number.

It is an amenable number.

212102021101 is a deficient number, since it is larger than the sum of its proper divisors (825299951).

212102021101 is an equidigital number, since it uses as much as digits as its factorization.

212102021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825299950.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212102021101 its reverse (101120201212), we get a palindrome (313222222313).

The spelling of 212102021101 in words is "two hundred twelve billion, one hundred two million, twenty-one thousand, one hundred one".