111222021021020 has 72 divisors (see below), whose sum is σ = 289045631022624. Its totient is φ = 35199936315648.

The previous prime is 111222021020987. The next prime is 111222021021029. The reversal of 111222021021020 is 20120120222111.

It is a self number, because there is not a number n which added to its sum of digits gives 111222021021020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111222021021029) 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, 2350399439 + ... + 2350446758.

It is an arithmetic number, because the mean of its divisors is an integer number (4014522653092).

Almost surely, 2^{111222021021020} is an apocalyptic number.

111222021021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111222021021020 is an abundant number, since it is smaller than the sum of its proper divisors (177823610001604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111222021021020 is a wasteful number, since it uses less digits than its factorization.

111222021021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700846239 (or 4700846224 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 111222021021020 its reverse (20120120222111), we get a palindrome (131342141243131).

The spelling of 111222021021020 in words is "one hundred eleven trillion, two hundred twenty-two billion, twenty-one million, twenty-one thousand, twenty".