212031101 has 4 divisors (see below), whose sum is σ = 212075292. Its totient is φ = 211986912.

The previous prime is 212031097. The next prime is 212031119. The reversal of 212031101 is 101130212.

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 200647225 + 11383876 = 14165^2 + 3374^2 .

It is a cyclic number.

It is not a de Polignac number, because 212031101 - 2² = 212031097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212031161) 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, 13880 + ... + 24833.

It is an arithmetic number, because the mean of its divisors is an integer number (53018823).

Almost surely, 2^212031101 is an apocalyptic number.

It is an amenable number.

212031101 is a deficient number, since it is larger than the sum of its proper divisors (44191).

212031101 is an equidigital number, since it uses as much as digits as its factorization.

212031101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44190.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 212031101 is about 14561.2877521186. The cubic root of 212031101 is about 596.3023526704.

Adding to 212031101 its reverse (101130212), we get a palindrome (313161313).

The spelling of 212031101 in words is "two hundred twelve million, thirty-one thousand, one hundred one".