212111112021021 has 12 divisors (see below), whose sum is σ = 306452019098940. Its totient is φ = 141375422597760.

The previous prime is 212111112021001. The next prime is 212111112021079. The reversal of 212111112021021 is 120120211111212.

It is a happy number.

212111112021021 is a `hidden beast` number, since 212 + 111 + 112 + 0 + 210 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 141552624012921 + 70558488008100 = 11897589^2 + 8399910^2 .

It is not a de Polignac number, because 212111112021021 - 2⁶ = 212111112020957 is a prime.

It is a super-2 number, since 2×212111112021021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212111112020985 and 212111112021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111112021001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2665409356 + ... + 2665488933.

It is an arithmetic number, because the mean of its divisors is an integer number (25537668258245).

Almost surely, 2^{212111112021021} is an apocalyptic number.

It is an amenable number.

212111112021021 is a deficient number, since it is larger than the sum of its proper divisors (94340907077919).

212111112021021 is a wasteful number, since it uses less digits than its factorization.

212111112021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330902716 (or 5330902713 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 212111112021021 its reverse (120120211111212), we get a palindrome (332231323132233).

The spelling of 212111112021021 in words is "two hundred twelve trillion, one hundred eleven billion, one hundred twelve million, twenty-one thousand, twenty-one".