212112211021 has 8 divisors (see below), whose sum is σ = 216514751544. Its totient is φ = 207739518720.

The previous prime is 212112211019. The next prime is 212112211037. The reversal of 212112211021 is 120112211212.

It can be written as a sum of positive squares in 4 ways, for example, as 3159002025 + 208953208996 = 56205^2 + 457114^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 212112211021 - 2¹ = 212112211019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212112210986 and 212112211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112211921) 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, 7447696 + ... + 7476121.

It is an arithmetic number, because the mean of its divisors is an integer number (27064343943).

Almost surely, 2^212112211021 is an apocalyptic number.

It is an amenable number.

212112211021 is a deficient number, since it is larger than the sum of its proper divisors (4402540523).

212112211021 is a wasteful number, since it uses less digits than its factorization.

212112211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14924111.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212112211021 its reverse (120112211212), we get a palindrome (332224422233).

The spelling of 212112211021 in words is "two hundred twelve billion, one hundred twelve million, two hundred eleven thousand, twenty-one".