12212110212021 has 20 divisors (see below), whose sum is σ = 18242915398092. Its totient is φ = 8141347240128.

The previous prime is 12212110212011. The next prime is 12212110212073. The reversal of 12212110212021 is 12021201121221.

12212110212021 is a `hidden beast` number, since 1 + 221 + 211 + 0 + 212 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 897538338225 + 11314571873796 = 947385^2 + 3363714^2 .

It is not a de Polignac number, because 12212110212021 - 2¹¹ = 12212110209973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12212110211985 and 12212110212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212110212011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12474835 + ... + 13418111.

Almost surely, 2^{12212110212021} is an apocalyptic number.

It is an amenable number.

12212110212021 is a deficient number, since it is larger than the sum of its proper divisors (6030805186071).

12212110212021 is an equidigital number, since it uses as much as digits as its factorization.

12212110212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103122 (or 1103113 counting only the distinct ones).

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

Adding to 12212110212021 its reverse (12021201121221), we get a palindrome (24233311333242).

The spelling of 12212110212021 in words is "twelve trillion, two hundred twelve billion, one hundred ten million, two hundred twelve thousand, twenty-one".