111220100021021 has 4 divisors (see below), whose sum is σ = 111294296220000. Its totient is φ = 111145903822044.

The previous prime is 111220100021003. The next prime is 111220100021071. The reversal of 111220100021021 is 120120001022111.

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 not a de Polignac number, because 111220100021021 - 2⁴⁶ = 40851355843357 is a prime.

It is a super-3 number, since 3×111220100021021³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111220100020987 and 111220100021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220100021071) 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, 37098097241 + ... + 37098100238.

It is an arithmetic number, because the mean of its divisors is an integer number (27823574055000).

Almost surely, 2^{111220100021021} is an apocalyptic number.

It is an amenable number.

111220100021021 is a deficient number, since it is larger than the sum of its proper divisors (74196198979).

111220100021021 is an equidigital number, since it uses as much as digits as its factorization.

111220100021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74196198978.

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

Adding to 111220100021021 its reverse (120120001022111), we get a palindrome (231340101043132).

The spelling of 111220100021021 in words is "one hundred eleven trillion, two hundred twenty billion, one hundred million, twenty-one thousand, twenty-one".