211110021211221 has 36 divisors (see below), whose sum is σ = 352819319230560. Its totient is φ = 121211495420400.

The previous prime is 211110021211217. The next prime is 211110021211253. The reversal of 211110021211221 is 122112120011112.

It is a happy number.

211110021211221 is a `hidden beast` number, since 2 + 111 + 100 + 21 + 211 + 221 = 666.

It is not a de Polignac number, because 211110021211221 - 2² = 211110021211217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211110021211194 and 211110021211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211110021211721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5101473225 + ... + 5101514606.

Almost surely, 2^{211110021211221} is an apocalyptic number.

It is an amenable number.

211110021211221 is a deficient number, since it is larger than the sum of its proper divisors (141709298019339).

211110021211221 is a wasteful number, since it uses less digits than its factorization.

211110021211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10202987878 (or 10202987864 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 211110021211221 its reverse (122112120011112), we get a palindrome (333222141222333).

The spelling of 211110021211221 in words is "two hundred eleven trillion, one hundred ten billion, twenty-one million, two hundred eleven thousand, two hundred twenty-one".