212113032221 has 4 divisors (see below), whose sum is σ = 212114051100. Its totient is φ = 212112013344.

The previous prime is 212113032169. The next prime is 212113032223. The reversal of 212113032221 is 122230311212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 121881283225 + 90231748996 = 349115^2 + 300386^2 .

It is a cyclic number.

It is not a de Polignac number, because 212113032221 - 2¹⁰ = 212113031197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212113032193 and 212113032202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212113032223) 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, 71906 + ... + 655283.

It is an arithmetic number, because the mean of its divisors is an integer number (53028512775).

Almost surely, 2^212113032221 is an apocalyptic number.

It is an amenable number.

212113032221 is a deficient number, since it is larger than the sum of its proper divisors (1018879).

212113032221 is an equidigital number, since it uses as much as digits as its factorization.

212113032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018878.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 212113032221 its reverse (122230311212), we get a palindrome (334343343433).

The spelling of 212113032221 in words is "two hundred twelve billion, one hundred thirteen million, thirty-two thousand, two hundred twenty-one".