111111022100021 has 4 divisors (see below), whose sum is σ = 111141826379232. Its totient is φ = 111080217820812.

The previous prime is 111111022099967. The next prime is 111111022100053. The reversal of 111111022100021 is 120001220111111.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111111022100021 is a prime.

It is a super-2 number, since 2×111111022100021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111111022099969 and 111111022100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111022100081) 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, 15402134195 + ... + 15402141408.

It is an arithmetic number, because the mean of its divisors is an integer number (27785456594808).

Almost surely, 2^{111111022100021} is an apocalyptic number.

It is an amenable number.

111111022100021 is a deficient number, since it is larger than the sum of its proper divisors (30804279211).

111111022100021 is an equidigital number, since it uses as much as digits as its factorization.

111111022100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30804279210.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111111022100021 its reverse (120001220111111), we get a palindrome (231112242211132).

The spelling of 111111022100021 in words is "one hundred eleven trillion, one hundred eleven billion, twenty-two million, one hundred thousand, twenty-one".