101111211121221 has 24 divisors (see below), whose sum is σ = 170795460355520. Its totient is φ = 56434164345216.

The previous prime is 101111211121189. The next prime is 101111211121259. The reversal of 101111211121221 is 122121112111101.

101111211121221 is a `hidden beast` number, since 1 + 0 + 1 + 111 + 211 + 121 + 221 = 666.

It is not a de Polignac number, because 101111211121221 - 2⁵ = 101111211121189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 101111211121194 and 101111211121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101111211121121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18662088676 + ... + 18662094093.

Almost surely, 2^{101111211121221} is an apocalyptic number.

It is an amenable number.

101111211121221 is a deficient number, since it is larger than the sum of its proper divisors (69684249234299).

101111211121221 is a wasteful number, since it uses less digits than its factorization.

101111211121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37324182825 (or 37324182822 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 101111211121221 its reverse (122121112111101), we get a palindrome (223232323232322).

The spelling of 101111211121221 in words is "one hundred one trillion, one hundred eleven billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".