211110221012121 has 20 divisors (see below), whose sum is σ = 315388691151732. Its totient is φ = 140728316813568.

The previous prime is 211110221012111. The next prime is 211110221012153. The reversal of 211110221012121 is 121210122011112.

It is a happy number.

211110221012121 is a `hidden beast` number, since 211 + 1 + 102 + 210 + 121 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 120085741556496 + 91024479455625 = 10958364^2 + 9540675^2 .

It is not a de Polignac number, because 211110221012121 - 2¹⁰ = 211110221011097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211110221012094 and 211110221012103.

It is not an unprimeable number, because it can be changed into a prime (211110221012111) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 108572320 + ... + 110499633.

Almost surely, 2^{211110221012121} is an apocalyptic number.

It is an amenable number.

211110221012121 is a deficient number, since it is larger than the sum of its proper divisors (104278470139611).

211110221012121 is a wasteful number, since it uses less digits than its factorization.

211110221012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219083862 (or 219083853 counting only the distinct ones).

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

Adding to 211110221012121 its reverse (121210122011112), we get a palindrome (332320343023233).

The spelling of 211110221012121 in words is "two hundred eleven trillion, one hundred ten billion, two hundred twenty-one million, twelve thousand, one hundred twenty-one".