111121000021 has 32 divisors (see below), whose sum is σ = 124377866496. Its totient is φ = 98736000000.

The previous prime is 111121000019. The next prime is 111121000031. The reversal of 111121000021 is 120000121111.

It is not a de Polignac number, because 111121000021 - 2¹ = 111121000019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111120999971 and 111121000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121000031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13067271 + ... + 13075771.

It is an arithmetic number, because the mean of its divisors is an integer number (3886808328).

Almost surely, 2^111121000021 is an apocalyptic number.

It is an amenable number.

111121000021 is a deficient number, since it is larger than the sum of its proper divisors (13256866475).

111121000021 is a wasteful number, since it uses less digits than its factorization.

111121000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8973.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 111121000021 its reverse (120000121111), we get a palindrome (231121121132).

The spelling of 111121000021 in words is "one hundred eleven billion, one hundred twenty-one million, twenty-one", and thus it is an aban number.