212111232021 has 24 divisors (see below), whose sum is σ = 329967584856. Its totient is φ = 130523351040.

The previous prime is 212111232019. The next prime is 212111232043. The reversal of 212111232021 is 120232111212.

212111232021 is a `hidden beast` number, since 212 + 1 + 112 + 320 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 15608754225 + 196502477796 = 124935^2 + 443286^2 .

It is not a de Polignac number, because 212111232021 - 2¹ = 212111232019 is a prime.

It is a super-3 number, since 3×212111232021³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212111231985 and 212111232003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111232071) 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, 3294781 + ... + 3358541.

It is an arithmetic number, because the mean of its divisors is an integer number (13748649369).

Almost surely, 2^212111232021 is an apocalyptic number.

It is an amenable number.

212111232021 is a deficient number, since it is larger than the sum of its proper divisors (117856352835).

212111232021 is a wasteful number, since it uses less digits than its factorization.

212111232021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92213 (or 92210 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 212111232021 its reverse (120232111212), we get a palindrome (332343343233).

The spelling of 212111232021 in words is "two hundred twelve billion, one hundred eleven million, two hundred thirty-two thousand, twenty-one".