212011013221 has 8 divisors (see below), whose sum is σ = 242305306304.
Its totient is φ = 181718471520.
The previous prime is 212011013219. The next prime is 212011013257. The reversal of 212011013221 is 122310110212.
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 212011013221 - 21 = 212011013219 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 212011013195 and 212011013204.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (212011013261) 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, 167295 + ... + 672316.
It is an arithmetic number, because the mean of its divisors is an integer number (30288163288).
Almost surely, 2212011013221 is an apocalyptic number.
It is an amenable number.
212011013221 is a deficient number, since it is larger than the sum of its proper divisors (30294293083).
212011013221 is an equidigital number, since it uses as much as digits as its factorization.
212011013221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 875691.
The product of its (nonzero) digits is 48, while the sum is 16.
Adding to 212011013221 its reverse (122310110212), we get a palindrome (334321123433).
The spelling of 212011013221 in words is "two hundred twelve billion, eleven million, thirteen thousand, two hundred twenty-one".