212011101221 has 8 divisors (see below), whose sum is σ = 216979983360. Its totient is φ = 207078095952.

The previous prime is 212011101217. The next prime is 212011101223. The reversal of 212011101221 is 122101110212.

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 212011101221 - 2² = 212011101217 is a prime.

It is a super-2 number, since 2×212011101221² (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 = 212011101196 and 212011101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011101223) 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, 8957261 + ... + 8980898.

It is an arithmetic number, because the mean of its divisors is an integer number (27122497920).

Almost surely, 2^212011101221 is an apocalyptic number.

It is an amenable number.

212011101221 is a deficient number, since it is larger than the sum of its proper divisors (4968882139).

212011101221 is a wasteful number, since it uses less digits than its factorization.

212011101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17938435.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 212011101221 its reverse (122101110212), we get a palindrome (334112211433).

The spelling of 212011101221 in words is "two hundred twelve billion, eleven million, one hundred one thousand, two hundred twenty-one".