111111022120221 has 96 divisors (see below), whose sum is σ = 169653591244800. Its totient is φ = 69933249365760.

The previous prime is 111111022120213. The next prime is 111111022120223. The reversal of 111111022120221 is 122021220111111.

It is a happy number.

111111022120221 is a `hidden beast` number, since 1 + 111 + 110 + 221 + 2 + 0 + 221 = 666.

It is not a de Polignac number, because 111111022120221 - 2³ = 111111022120213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111111022120194 and 111111022120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111022120223) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 40864662900 + ... + 40864665618.

It is an arithmetic number, because the mean of its divisors is an integer number (1767224908800).

Almost surely, 2^{111111022120221} is an apocalyptic number.

It is an amenable number.

111111022120221 is a deficient number, since it is larger than the sum of its proper divisors (58542569124579).

111111022120221 is a wasteful number, since it uses less digits than its factorization.

111111022120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5951 (or 5948 counting only the distinct ones).

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

Adding to 111111022120221 its reverse (122021220111111), we get a palindrome (233132242231332).

The spelling of 111111022120221 in words is "one hundred eleven trillion, one hundred eleven billion, twenty-two million, one hundred twenty thousand, two hundred twenty-one".