212111110010221 has 16 divisors (see below), whose sum is σ = 226077041433600. Its totient is φ = 198665750741248.

The previous prime is 212111110010179. The next prime is 212111110010251. The reversal of 212111110010221 is 122010011111212.

It is a cyclic number.

It is not a de Polignac number, because 212111110010221 - 2²³ = 212111101621613 is a prime.

It is a super-2 number, since 2×212111110010221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212111110010195 and 212111110010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111110010251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 688433461 + ... + 688741498.

It is an arithmetic number, because the mean of its divisors is an integer number (14129815089600).

Almost surely, 2^{212111110010221} is an apocalyptic number.

It is an amenable number.

212111110010221 is a deficient number, since it is larger than the sum of its proper divisors (13965931423379).

212111110010221 is a wasteful number, since it uses less digits than its factorization.

212111110010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377175148.

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

Adding to 212111110010221 its reverse (122010011111212), we get a palindrome (334121121121433).

The spelling of 212111110010221 in words is "two hundred twelve trillion, one hundred eleven billion, one hundred ten million, ten thousand, two hundred twenty-one".