111101012021 has 8 divisors (see below), whose sum is σ = 113829418584. Its totient is φ = 108373492480.

The previous prime is 111101011949. The next prime is 111101012047. The reversal of 111101012021 is 120210101111.

It can be written as a sum of positive squares in 4 ways, for example, as 468939025 + 110632072996 = 21655^2 + 332614^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111101012021 - 2²² = 111096817717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111101011993 and 111101012011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111101012821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35441 + ... + 472713.

It is an arithmetic number, because the mean of its divisors is an integer number (14228677323).

Almost surely, 2^111101012021 is an apocalyptic number.

It is an amenable number.

111101012021 is a deficient number, since it is larger than the sum of its proper divisors (2728406563).

111101012021 is an equidigital number, since it uses as much as digits as its factorization.

111101012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443511.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 111101012021 its reverse (120210101111), we get a palindrome (231311113132).

The spelling of 111101012021 in words is "one hundred eleven billion, one hundred one million, twelve thousand, twenty-one".