211221001101212 has 12 divisors (see below), whose sum is σ = 369848335655400. Its totient is φ = 105550048056816.

The previous prime is 211221001101211. The next prime is 211221001101239. The reversal of 211221001101212 is 212101100122112.

It is a super-2 number, since 2×211221001101212² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221001101211) 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, 15113115587 + ... + 15113129562.

It is an arithmetic number, because the mean of its divisors is an integer number (30820694637950).

Almost surely, 2^{211221001101212} is an apocalyptic number.

It is an amenable number.

211221001101212 is a deficient number, since it is larger than the sum of its proper divisors (158627334554188).

211221001101212 is a wasteful number, since it uses less digits than its factorization.

211221001101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30226246900 (or 30226246898 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211221001101212 its reverse (212101100122112), we get a palindrome (423322101223324).

The spelling of 211221001101212 in words is "two hundred eleven trillion, two hundred twenty-one billion, one million, one hundred one thousand, two hundred twelve".