212112002111221 has 4 divisors (see below), whose sum is σ = 213660264900492. Its totient is φ = 210563739321952.

The previous prime is 212112002111213. The next prime is 212112002111267. The reversal of 212112002111221 is 122111200211212.

It is a happy number.

212112002111221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 83758646400625 + 128353355710596 = 9151975^2 + 11329314^2 .

It is a cyclic number.

It is not a de Polignac number, because 212112002111221 - 2³ = 212112002111213 is a prime.

It is a super-2 number, since 2×212112002111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112002111021) 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, 774131394430 + ... + 774131394703.

It is an arithmetic number, because the mean of its divisors is an integer number (53415066225123).

Almost surely, 2^{212112002111221} is an apocalyptic number.

It is an amenable number.

212112002111221 is a deficient number, since it is larger than the sum of its proper divisors (1548262789271).

212112002111221 is a wasteful number, since it uses less digits than its factorization.

212112002111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548262789270.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212112002111221 its reverse (122111200211212), we get a palindrome (334223202322433).

The spelling of 212112002111221 in words is "two hundred twelve trillion, one hundred twelve billion, two million, one hundred eleven thousand, two hundred twenty-one".