111021001121220 has 24 divisors (see below), whose sum is σ = 310858803139584. Its totient is φ = 29605600298976.

The previous prime is 111021001121189. The next prime is 111021001121231. The reversal of 111021001121220 is 22121100120111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 111021001121220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925175009284 + ... + 925175009403.

It is an arithmetic number, because the mean of its divisors is an integer number (12952450130816).

Almost surely, 2^{111021001121220} is an apocalyptic number.

111021001121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111021001121220 is an abundant number, since it is smaller than the sum of its proper divisors (199837802018364).

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

111021001121220 is a wasteful number, since it uses less digits than its factorization.

111021001121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850350018699 (or 1850350018697 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111021001121220 its reverse (22121100120111), we get a palindrome (133142101241331).

The spelling of 111021001121220 in words is "one hundred eleven trillion, twenty-one billion, one million, one hundred twenty-one thousand, two hundred twenty".