111221101011021 has 4 divisors (see below), whose sum is σ = 148294801348032. Its totient is φ = 74147400674012.

The previous prime is 111221101010947. The next prime is 111221101011047. The reversal of 111221101011021 is 120110101122111.

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 111221101011021 - 2¹³ = 111221101002829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221101011221) 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, 18536850168501 + ... + 18536850168506.

It is an arithmetic number, because the mean of its divisors is an integer number (37073700337008).

Almost surely, 2^{111221101011021} is an apocalyptic number.

It is an amenable number.

111221101011021 is a deficient number, since it is larger than the sum of its proper divisors (37073700337011).

111221101011021 is an equidigital number, since it uses as much as digits as its factorization.

111221101011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37073700337010.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 111221101011021 its reverse (120110101122111), we get a palindrome (231331202133132).

The spelling of 111221101011021 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred one million, eleven thousand, twenty-one".