212110122100221 has 24 divisors (see below), whose sum is σ = 309541947478400. Its totient is φ = 139948001600256.

The previous prime is 212110122100183. The next prime is 212110122100271. The reversal of 212110122100221 is 122001221011212.

212110122100221 is a `hidden beast` number, since 2 + 121 + 101 + 221 + 0 + 0 + 221 = 666.

It is not a de Polignac number, because 212110122100221 - 2¹⁸ = 212110121838077 is a prime.

It is a super-2 number, since 2×212110122100221² (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 = 212110122100194 and 212110122100203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212110122100271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142977930 + ... + 144453828.

Almost surely, 2^{212110122100221} is an apocalyptic number.

It is an amenable number.

212110122100221 is a deficient number, since it is larger than the sum of its proper divisors (97431825378179).

212110122100221 is a wasteful number, since it uses less digits than its factorization.

212110122100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640625 (or 1640622 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 212110122100221 its reverse (122001221011212), we get a palindrome (334111343111433).

The spelling of 212110122100221 in words is "two hundred twelve trillion, one hundred ten billion, one hundred twenty-two million, one hundred thousand, two hundred twenty-one".