111002121021 has 12 divisors (see below), whose sum is σ = 162680794976. Its totient is φ = 67274012520.

The previous prime is 111002121017. The next prime is 111002121029. The reversal of 111002121021 is 120121200111.

It is not a de Polignac number, because 111002121021 - 2² = 111002121017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111002120988 and 111002121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111002121029) 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 11 ways as a sum of consecutive naturals, for example, 152895121 + ... + 152895846.

Almost surely, 2^111002121021 is an apocalyptic number.

111002121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111002121021 is a deficient number, since it is larger than the sum of its proper divisors (51678673955).

111002121021 is a wasteful number, since it uses less digits than its factorization.

111002121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305790992 (or 305790981 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111002121021 its reverse (120121200111), we get a palindrome (231123321132).

The spelling of 111002121021 in words is "one hundred eleven billion, two million, one hundred twenty-one thousand, twenty-one".