101111211221 has 4 divisors (see below), whose sum is σ = 101114011392. Its totient is φ = 101108411052.

The previous prime is 101111211211. The next prime is 101111211241. The reversal of 101111211221 is 122112111101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122112111101 = 199 ⋅613628699.

It is a cyclic number.

It is not a de Polignac number, because 101111211221 - 2¹⁰ = 101111210197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101111211196 and 101111211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101111211211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1345205 + ... + 1418378.

It is an arithmetic number, because the mean of its divisors is an integer number (25278502848).

Almost surely, 2^101111211221 is an apocalyptic number.

It is an amenable number.

101111211221 is a deficient number, since it is larger than the sum of its proper divisors (2800171).

101111211221 is an equidigital number, since it uses as much as digits as its factorization.

101111211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2800170.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 101111211221 its reverse (122112111101), we get a palindrome (223223322322).

The spelling of 101111211221 in words is "one hundred one billion, one hundred eleven million, two hundred eleven thousand, two hundred twenty-one".