101111213221 has 4 divisors (see below), whose sum is σ = 102112314444. Its totient is φ = 100110112000.

The previous prime is 101111213149. The next prime is 101111213267. The reversal of 101111213221 is 122312111101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70612432900 + 30498780321 = 265730^2 + 174639^2 .

It is a cyclic number.

It is not a de Polignac number, because 101111213221 - 2¹⁵ = 101111180453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101111213195 and 101111213204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101111213521) 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, 500550460 + ... + 500550661.

It is an arithmetic number, because the mean of its divisors is an integer number (25528078611).

Almost surely, 2^101111213221 is an apocalyptic number.

It is an amenable number.

101111213221 is a deficient number, since it is larger than the sum of its proper divisors (1001101223).

101111213221 is a wasteful number, since it uses less digits than its factorization.

101111213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001101222.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 101111213221 its reverse (122312111101), we get a palindrome (223423324322).

The spelling of 101111213221 in words is "one hundred one billion, one hundred eleven million, two hundred thirteen thousand, two hundred twenty-one".