111022011221 has 4 divisors (see below), whose sum is σ = 121114921344. Its totient is φ = 100929101100.

The previous prime is 111022011151. The next prime is 111022011227. The reversal of 111022011221 is 122110220111.

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: 122110220111 = 11 ⋅11100929101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111022011221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111022011196 and 111022011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111022011227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5046455045 + ... + 5046455066.

It is an arithmetic number, because the mean of its divisors is an integer number (30278730336).

Almost surely, 2^111022011221 is an apocalyptic number.

111022011221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111022011221 is a deficient number, since it is larger than the sum of its proper divisors (10092910123).

111022011221 is a wasteful number, since it uses less digits than its factorization.

111022011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10092910122.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111022011221 its reverse (122110220111), we get a palindrome (233132231332).

The spelling of 111022011221 in words is "one hundred eleven billion, twenty-two million, eleven thousand, two hundred twenty-one".