212111021 has 8 divisors (see below), whose sum is σ = 219916800. Its totient is φ = 204365520.

The previous prime is 212110981. The next prime is 212111027. The reversal of 212111021 is 120111212.

212111021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212111021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212110993 and 212111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7841 + ... + 22038.

It is an arithmetic number, because the mean of its divisors is an integer number (27489600).

Almost surely, 2^212111021 is an apocalyptic number.

It is an amenable number.

212111021 is a deficient number, since it is larger than the sum of its proper divisors (7805779).

212111021 is a wasteful number, since it uses less digits than its factorization.

212111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30139.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 212111021 is about 14564.0317563510. The cubic root of 212111021 is about 596.3772638468.

Adding to 212111021 its reverse (120111212), we get a palindrome (332222233).

The spelling of 212111021 in words is "two hundred twelve million, one hundred eleven thousand, twenty-one".