212221112101 has 4 divisors (see below), whose sum is σ = 212230574604. Its totient is φ = 212211649600.

The previous prime is 212221112039. The next prime is 212221112219. The reversal of 212221112101 is 101211122212.

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 112365744100 + 99855368001 = 335210^2 + 315999^2 .

It is a cyclic number.

It is not a de Polignac number, because 212221112101 - 2¹³ = 212221103909 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 (212221115101) 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, 4697530 + ... + 4742491.

It is an arithmetic number, because the mean of its divisors is an integer number (53057643651).

Almost surely, 2^212221112101 is an apocalyptic number.

It is an amenable number.

212221112101 is a deficient number, since it is larger than the sum of its proper divisors (9462503).

212221112101 is an equidigital number, since it uses as much as digits as its factorization.

212221112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9462502.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212221112101 its reverse (101211122212), we get a palindrome (313432234313).

It can be divided in two parts, 2122211 and 12101, that added together give a palindrome (2134312).

The spelling of 212221112101 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred twelve thousand, one hundred one".