111002011220021 has 4 divisors (see below), whose sum is σ = 111078406273932. Its totient is φ = 110925616166112.

The previous prime is 111002011220011. The next prime is 111002011220027. The reversal of 111002011220021 is 120022110200111.

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 47006587138225 + 63995424081796 = 6856135^2 + 7999714^2 .

It is a cyclic number.

It is not a de Polignac number, because 111002011220021 - 2²² = 111002007025717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111002011219978 and 111002011220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111002011220027) 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, 38197524776 + ... + 38197527681.

It is an arithmetic number, because the mean of its divisors is an integer number (27769601568483).

Almost surely, 2^{111002011220021} is an apocalyptic number.

It is an amenable number.

111002011220021 is a deficient number, since it is larger than the sum of its proper divisors (76395053911).

111002011220021 is an equidigital number, since it uses as much as digits as its factorization.

111002011220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76395053910.

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

Adding to 111002011220021 its reverse (120022110200111), we get a palindrome (231024121420132).

The spelling of 111002011220021 in words is "one hundred eleven trillion, two billion, eleven million, two hundred twenty thousand, twenty-one".