111122100021 has 4 divisors (see below), whose sum is σ = 148162800032. Its totient is φ = 74081400012.

The previous prime is 111122100017. The next prime is 111122100029. The reversal of 111122100021 is 120001221111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 111122100021 - 2² = 111122100017 is a prime.

It is a super-2 number, since 2×111122100021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111122100029) 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 3 ways as a sum of consecutive naturals, for example, 18520350001 + ... + 18520350006.

It is an arithmetic number, because the mean of its divisors is an integer number (37040700008).

Almost surely, 2^111122100021 is an apocalyptic number.

It is an amenable number.

111122100021 is a deficient number, since it is larger than the sum of its proper divisors (37040700011).

111122100021 is an equidigital number, since it uses as much as digits as its factorization.

111122100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37040700010.

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

Adding to 111122100021 its reverse (120001221111), we get a palindrome (231123321132).

The spelling of 111122100021 in words is "one hundred eleven billion, one hundred twenty-two million, one hundred thousand, twenty-one".