212212101 has 4 divisors (see below), whose sum is σ = 282949472. Its totient is φ = 141474732.

The previous prime is 212212093. The next prime is 212212123. The reversal of 212212101 is 101212212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 212212101 - 2³ = 212212093 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 (212212141) 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, 35368681 + ... + 35368686.

It is an arithmetic number, because the mean of its divisors is an integer number (70737368).

Almost surely, 2^212212101 is an apocalyptic number.

It is an amenable number.

212212101 is a deficient number, since it is larger than the sum of its proper divisors (70737371).

212212101 is an equidigital number, since it uses as much as digits as its factorization.

212212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70737370.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 212212101 is about 14567.5015359532. The cubic root of 212212101 is about 596.4719819186.

Adding to 212212101 its reverse (101212212), we get a palindrome (313424313).

It can be divided in two parts, 212212 and 101, that multiplied together give a palindrome (21433412).

The spelling of 212212101 in words is "two hundred twelve million, two hundred twelve thousand, one hundred one".