211221201101212 has 6 divisors (see below), whose sum is σ = 369637101927128. Its totient is φ = 105610600550604.

The previous prime is 211221201101177. The next prime is 211221201101219. The reversal of 211221201101212 is 212101102122112.

It is a happy number.

It is a super-2 number, since 2×211221201101212² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211221201101212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221201101219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26402650137648 + ... + 26402650137655.

Almost surely, 2^{211221201101212} is an apocalyptic number.

It is an amenable number.

211221201101212 is a deficient number, since it is larger than the sum of its proper divisors (158415900825916).

211221201101212 is a wasteful number, since it uses less digits than its factorization.

211221201101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52805300275307 (or 52805300275305 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211221201101212 its reverse (212101102122112), we get a palindrome (423322303223324).

The spelling of 211221201101212 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred one million, one hundred one thousand, two hundred twelve".