212112021 has 16 divisors (see below), whose sum is σ = 313758720. Its totient is φ = 126372720.

The previous prime is 212112001. The next prime is 212112023. The reversal of 212112021 is 120211212.

It is not a de Polignac number, because 212112021 - 2¹⁵ = 212079253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212111988 and 212112006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52525 + ... + 56418.

It is an arithmetic number, because the mean of its divisors is an integer number (19609920).

Almost surely, 2^212112021 is an apocalyptic number.

It is an amenable number.

212112021 is a deficient number, since it is larger than the sum of its proper divisors (101646699).

212112021 is a wasteful number, since it uses less digits than its factorization.

212112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109016.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 212112021 is about 14564.0660874633. The cubic root of 212112021 is about 596.3782010546.

Adding to 212112021 its reverse (120211212), we get a palindrome (332323233).

It can be divided in two parts, 21211 and 2021, that added together give a palindrome (23232).

The spelling of 212112021 in words is "two hundred twelve million, one hundred twelve thousand, twenty-one".