212201110021 has 4 divisors (see below), whose sum is σ = 213026795532. Its totient is φ = 211375424512.

The previous prime is 212201110003. The next prime is 212201110061. The reversal of 212201110021 is 120011102212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95011281121 + 117189828900 = 308239^2 + 342330^2 .

It is a cyclic number.

It is not a de Polignac number, because 212201110021 - 2⁹ = 212201109509 is a prime.

It is a super-2 number, since 2×212201110021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212201109983 and 212201110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212201110061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412842370 + ... + 412842883.

It is an arithmetic number, because the mean of its divisors is an integer number (53256698883).

Almost surely, 2^212201110021 is an apocalyptic number.

It is an amenable number.

212201110021 is a deficient number, since it is larger than the sum of its proper divisors (825685511).

212201110021 is an equidigital number, since it uses as much as digits as its factorization.

212201110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825685510.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212201110021 its reverse (120011102212), we get a palindrome (332212212233).

The spelling of 212201110021 in words is "two hundred twelve billion, two hundred one million, one hundred ten thousand, twenty-one".