111221011121001 has 4 divisors (see below), whose sum is σ = 148294681494672. Its totient is φ = 74147340747332.

The previous prime is 111221011120993. The next prime is 111221011121027. The reversal of 111221011121001 is 100121110122111.

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 111221011121001 - 2³ = 111221011120993 is a prime.

It is a super-2 number, since 2×111221011121001² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111221011121501) 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, 18536835186831 + ... + 18536835186836.

It is an arithmetic number, because the mean of its divisors is an integer number (37073670373668).

Almost surely, 2^{111221011121001} is an apocalyptic number.

It is an amenable number.

111221011121001 is a deficient number, since it is larger than the sum of its proper divisors (37073670373671).

111221011121001 is an equidigital number, since it uses as much as digits as its factorization.

111221011121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37073670373670.

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

Adding to 111221011121001 its reverse (100121110122111), we get a palindrome (211342121243112).

The spelling of 111221011121001 in words is "one hundred eleven trillion, two hundred twenty-one billion, eleven million, one hundred twenty-one thousand, one".